Find the missing letters in the following series.

EV, GT, IR, KP, ?

EV, GT, IR, KP, ?

Logic: Add 2 and substract 2.

EV:
E + 2 = G
V - 2 = T
GT:
G + 2 = I
T - 2 = R
IR:
I + 2 = K
R - 2 = P

Follow this pattern;
KP:
K + 2 = M
P - 2 = N

So, the next pair of letters should be MN.

Thus, the correct answer is (c).