Which of the following options will complete the given series?
KMQW, LNSX, MPTY, ?

The correct option is NQUZ.

To find the missing term in the given series KMQW, LNSX, MPTY, ?, let us analyze the pattern by examining the position of each letter in the English alphabet for every term.

1. First letter of each term:
K (11) ⇒ L (12) ⇒ M (13) ⇒ N (14)
Pattern: Each letter advances by 1 position (+1).

2. Second letter of each term:
M (13) ⇒ N (14) ⇒ P (16) ⇒ Q (17)
Let us observe the pattern: M to N is +1, N to P is +2, P to Q is +1. Following this pattern (+1, +2, +1...), the next step from P is +1, which gives Q.

3. Third letter of each term:
Q (17) ⇒ S (19) ⇒ T (20) ⇒ U (21)
Let us observe the pattern: Q to S is +2, S to T is +1, T to U is +1. Alternatively, examining the position progression: 17, 19, 20, 21. Continuing from T (20), adding +1 gives U (21), resulting in U.

4. Fourth letter of each term:
W (23) ⇒ X (24) ⇒ Y (25) ⇒ Z (26)
Pattern: Each letter advances by 1 position (+1).

Combining all the derived letters in order gives NQUZ.