Select the term that will come next in the following series. CAY, FDB…

Explanation:

CAY, FDB, IGE, .........

The logic followed here is :

C → (+3) → F → (+3) → I → (+3) → L 

A → (+3) → D → (+3) → G → (+3) → J 

Y → (+3) → B → (+3) → E → (+3) → H 

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