I’m not sure about the wording of the question, but wouldn’t it be all real numbers?
D. None of those. The actual answer should be X + 7/2
Answer: 
Step-by-step explanation:
Given
inclination is 
Mountain is
high
Cable is tied
from the base of the mountain
From the figure, length of the shortest path is 
It is given by using Pythagoras theorem

Your answer would be 24/25