​Which one will replace the question mark?

E	G	I
R	U	X
J	N	?

Logic: 1st row letters are increasing + 2, 2nd row letters are increasing + 3 and 3rd row letters are increasing + 4 place.

For, 1st row

E + 2 = G, G + 2 = I

For, 2nd row

R + 3 = U, U + 3 = X

For, 3rd row

J + 4 = N, N + 4 = R

Thus, correct option is (b).