Answer:

2 3/4 - 1 1/2

Let's transform them to decimal for simple solution.

2 3/4 is 2.75 and 1 1/2 is 1.5

Then, subtract

2.75 - 1.5?

Equals to, 1.25

Transform the decimal to fraction that is...

1 1/4

Final answer: A. 1 1/4