The answer is A.
Since 4.5 is the first number, that is the starting point.
Since we are subtract 2.5, we are going to move 2.5 units to the left of 4.5.
Subtract to check.
4.5 - 2.5 = 2 (Final point is at 2)
The only number line that satisfies our needs is A. Thus, proves our answer.
Best of Luck!
