A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

ML, RQ, WV, BA, ?

GF

Explanation:

ML, RQ, WV, BA, ?

The logic followed here is :

M → (+5) → R → (+5) → W → (+5) → B → (+5) → G  

L → (+5) → Q → (+5) → V → (+5) → A → (+5) → F  

So, the letter-cluster that replaces the (?) to complete the series is "GF"