Correct Answer:
B. $A$1
The correct answer is $A$1. In spreadsheet applications like Microsoft Excel, an absolute cell reference is used to keep a cell's location constant when a formula is copied or filled to other cells. This is achieved by placing a dollar sign ($) before both the column letter and the row number.
- A1 is a relative cell reference, meaning it changes based on the relative position of the cell where the formula is copied.
- IA1 is not a standard or valid cell reference format in most spreadsheet programs.
- The other A1 option is also a relative reference.