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nerdsrocks
The answer is D =($A$1-$B$1) 

sources:just took the test

Answer:

D.)=($A$1-$B$1)

Explanation:

The $ sign placed in between the characters of a cell makes the cell an absolute reference in any formula that involves the cell.

For example, the function "=A1 - $B$2" would give a result equivalent to "=A1 - B2" however, a drag down of the formula would result in a change of the function A1 to A2, A3, A4, A5...

Hence from the options, =($A$1-$B$1) is the only formula with absolute references.