Final answer:
To have the sum appear in the row when using AutoSum with a row of four values, the cursor must be on the first empty cell to the right of the last cell containing a value.
Step-by-step explanation:
The correct answer is a) On the first empty cell to the right of the last cell containing a value.
When using AutoSum with a row of four values, your cursor should be on the first empty cell to the right of the last cell containing a value. The AutoSum function automatically selects the range of cells to be summed based on the current selection. By placing the cursor on the first empty cell to the right, you ensure that the sum appears in the row.
For example, if the row of four values is A1, B1, C1, and D1, and you want the sum in E1, place your cursor on E1 and click on the AutoSum button.