Choose the option that shall come in place of the ? in the following series:

25WV52, 23TS32, 21QP12, ?, 17KJ71

Looking at the series: 25WV52, 23TS32, 21QP12, ?, 17KJ71

Each term has the pattern: [Number][Letters][Number]

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Analyzing the first numbers: 25, 23, 21, ?, 17

The sequence decreases by 2 each time:

25 - 2 = 23

23 - 2 = 21

21 - 2 = 19

19 - 2 = 17

The missing first number is 19.

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Analyzing the letter pairs: WV, TS, QP, ?, KJ

Finding alphabet positions:

W = 23, V = 22

T = 20, S = 19

Q = 17, P = 16

K = 11, J = 10

For the first letters: 23, 20, 17, ?, 11

The sequence decreases by 3 each time:

23 - 3 = 20

20 - 3 = 17

17 - 3 = 14 → N

14 - 3 = 11

For the second letters: 22, 19, 16, ?, 10

The sequence decreases by 3 each time:

22 - 3 = 19

19 - 3 = 16

16 - 3 = 13 → M

13 - 3 = 10

The missing letter pair is NM.

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Analyzing the last numbers: 52, 32, 12, ?, 71

From the options available with 19NM:

Option 3 gives 19NM91

This completes the pattern: 25WV52, 23TS32, 21QP12, 19NM91, 17KJ71

Therefore, the answer is Option 3.