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Solution

Correct Option: 4

Numbers should be 1, 5, 9, 13, 17 (arithmetic progression with difference 4). First letters C, F, I, L, O increase by 3 each. Second letters V, U, T, S, R decrease by 1 each. The letter pattern is intact, but the fourth term's number should be 13, not 15. So 15LS does not fit.

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