Explanation:

- The given series is QKR, UOV, YSZ, CWD, ?.

- Break down the sequence into their respective letter positions in the alphabet for each letter of the series:

- Q (17), K (11), R (18)

- U (21), O (15), V (22)

- Y (25), S (19), Z (26)

- C (3), W (23), D (4)

- Observe the increment pattern for each letter:

- First letters increase by +4 each step: Q (17) to U (21) to Y (25) to C (3)

- Second letters increase by +4 each step: K (11) to O (15) to S (19) to W (23)

- Third letters increase by +4 each step: R (18) to V (22) to Z (26) to D (4)

- Applying +4 increment gives us: G (7), A (1), H (8).

- Correct answer is "GAH".

- GAH is the correct answer.

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