What should come in place of the question mark (?) in the given series based on the English alphabetical order?
ECZ, HFC, KIF, NLI, ?

The correct option is QOL.

To find the missing term in the given series based on the English alphabetical order, let us analyze the pattern letter by letter for each term:

Given series: ECZ, HFC, KIF, NLI, ?

1. First letter pattern:
E (+3) ⇒ H
H (+3) ⇒ K
K (+3) ⇒ N
N (+3) ⇒ Q
So, the first letter of the missing term is Q.

2. Second letter pattern:
C (+3) ⇒ F
F (+3) ⇒ I
I (+3) ⇒ L
L (+3) ⇒ O
So, the second letter of the missing term is O.

3. Third letter pattern:
Z (+3) ⇒ C
C (+3) ⇒ F
F (+3) ⇒ I
I (+3) ⇒ L
So, the third letter of the missing term is L.

Combining all three letters, we get QOL.