What is the next number in the series?

ELFA, GLHA, ILJA, ?, MLNA​​

Given: ELFA, GLHA, ILJA, ?, MLNA

Logic: 1st letter and 3rd + 2 place and 2nd and 4th letter are common in the series.

For, 1st letter

E + 2 = G, G + 2 = I, I + 2 = K, K + 2 = M

For, 3rd letter

F + 2 = H, H + 2 = J, J + 2 = L, L + 2 =N

So, the missing term is KLLA.

Thus, correct option is (d).