Which Letter of the alphabet is as far away from C as Q is from X ?

The position of C in the alphabet is 3.
The position of Q in the alphabet is 17.

The gap between C and Q is: 17− 3 = 14 

Same logic on apply on X;

The position of X in the alphabet is 24.

24 - 14 = 10

So, The letter at position 10 in the alphabet is J.

Thus, the correct answer is (c).