Which of the following letter clusters will replace the question mark (?) in the given series to make it logically complete?

IKN, GHL, EEJ, CBH, ?

Given: IKN, GHL, EEJ, CBH, ?

​Logic: The first position follows the pattern of decreasing by 2.
The second position follows the pattern of decreasing by 3.
The third position follows the pattern of decreasing by 2.

I - 2 = G; G - 2 = E; E - 2 = C; C - 2 = A

K - 3 = H; H - 3 = E; E - 3 = B; B - 3 = Y

N - 2 = L; L - 2 = J; J - 2 = H; H - 2 = F

So, the missing term in the series will be AYF.

Thus, the correct answer is option (c).