The monthly interest is 7%/12 = 0.583333% (0.0058333)
The discount factor for 36 months is 1 / ((1.0058333)^36
So the answer is B
(Are you sure that the question asks for present value? Because the way it is worded otherwise makes it sound like the terminal value, which would mean multiplying by (1.0058333)^36 and would then give the answer D)