Which of the following terms will replace the question mark (?) in the given series?

GXMA, IVOY, KTQW, MRSU, ?

GXMA, IVOY, KTQW, MRSU, ?

Logic: ​Each letter position alternates with +2 and –2 shifts in alphabet order.

First Letters: ​G + 2 → I, I + 2 → K, K + 2 → M, M + 2 → O

Second Letters: X – 2 → V, V – 2 → T, T – 2 → R, R – 2 → P​

Third Letters: M + 2 → O, O + 2 → Q, Q + 2 → S, S + 2 → U

Fourth Letters: A – 2 → Y, Y – 2 → W, W – 2 → U, U – 2 → S​

So, the missing term in the series will be: OPUS. ​​

Thus, the correct option is: (c)​​