What should come in place of ? in the given series based on the English alphabetical order?
RST VZW ZGZ DNC ?

The correct option is HUF.

To find the missing term in the series, let us analyze the pattern followed by each letter of the terms in the given alphabetical series:

RST, VZW, ZGZ, DNC, ?

1. First Letter Pattern:
R + 4 = V
V + 4 = Z
Z + 4 = D
D + 4 = H
So, the first letter of the missing term is H.

2. Second Letter Pattern:
S + 7 = Z
Z + 7 = G
G + 7 = N
N + 7 = U
So, the second letter of the missing term is U.

3. Third Letter Pattern:
T + 3 = W
W + 3 = Z
Z + 3 = C
C + 3 = F
So, the third letter of the missing term is F.

Combining all the letters obtained, we get the term HUF.