The Lookup Function Won't Copy Down to Other Rows error occurs when a user uses a function in one cell and it works perfectly but when he attempts to copy the function down to other rows, he gets the #REF error. The #REF!Errorarises when Excel tries to reference an invalid cell. This error occurs if the user has referenced an entire worksheet by clicking on the grey square at the top left of the worksheet. For Excel, this reference range is 1 to 1048576. Since the references are Relative References, Excel automatically increases the row references when this cell is copied down to other rows in the spreadsheet.

Answer option C is incorrect. The Failure to Look Up Values in Excel error occurs when a user gets an unexpected error while trying to look up or match a lookup_value within an array and Excel is not able to recognize the matching value. If the lookup_value or the array the user issearching resides in a cell, the user can have unseen spaces at the start or end of that cell. This will create the situation where the contents of the two cells that the user is comparing look the same but extra spaces in one of the cells cause the cells to have slightly different content. The other reason is that the contents of the cells that are being compared may have different data types.

Answer option A is incorrect. The Excel Won't Calculate My Function error occurs when a user types in a function and pressesEnter;the cell shows the function as the user typed it, instead of

returning the function's value. The reason that causes this problem is that the cells containing

the formula are formatted as 'text' instead of the 'General' type. This happens when the user

inserts a new column, next to a column that is already formatted as text due to which the new

column inherits the formatting of the adjacent column.

The following ways are provided by Excel to access and use the stored change history:

1.Onscreen highlighting: It is used when a workbook does not contain many changes and a user wants to see all changes at a glance.

2.History tracking: It is used when a workbook has many changes and a user wants to investigate what occurred in a series of changes.

3.Reviewing of changes: It is used when a user is evaluating comments from other users. Answer option C is incorrect. This is an invalid answer option.

The Failure to Look Up Values in Excel error occurs when a user gets an unexpected error whiletrying to look up or match a lookup_value within an array and Excel is not able to recognize thematching value. If the lookup_value or the array the user is searching resides in a cell, the usercan have unseen spaces at the start or end of that cell. This will create the situation where thecontents of the two cells that the user is comparing look the same but extra spaces in one of thecells cause the cells to have slightly different content. The other reason is that the contents ofthe cells that are being compared may have different data types. Answer option C is incorrect. TheLookup Function Won't Copy Down to Other Rows error occurs when a user uses a function in one celland it works perfectly but when he attempts to copy the function down to other rows, he gets the#REF error. The #REF! error arises when Excel tries to reference an invalid cell. This error occursif the user has referenced an entire worksheet by clicking on the grey square at the top left ofthe worksheet. For Excel, this reference range is 1 to 1048576. Since the references are RelativeReferences, Excel automatically increases the row references when this cell is copied down to otherrows in the spreadsheet.

Answer option D is incorrect. The Excel Won't Calculate My Function error occurs when a user typesin a function and presses Enter, the cell shows the function as the user typed it, instead ofreturning the function's value. The reason that causes this problem is that the cellscontaining theformula are formatted as 'text' instead of the 'General' type. This happens when theuser insertsa new column, next to a column that is already formatted as text due to which thenew columninherits the formatting of the adjacent column.