In the following question, select the related letters from the given alternatives.
PTX: RVZ :: CGK: ?

Correct option is A

For PTX to RVZ:
P → R: The position of P is 16 and R is 18, so we add 2.
T → V: The position of T is 20 and V is 22, so we add 2.
X → Z: The position of X is 24 and Z is 26, so we add 2.
Now, apply the same logic to CGK:
C → E: The position of C is 3 and E is 5, so we add 2.
G → I: The position of G is 7 and I is 9, so we add 2.
K → M: The position of K is 11 and M is 13, so we add 2.
Thus, CGK becomes EIM.
The correct answer is (a) EIM.