- Option : B
- Explanation : After every pair, one letter is skipped.

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- Option : A
- Explanation : The first letters of all pairs given in the question follow a sequence of A + 2 = C, C + 2 = E and so on. The second letters are vowels.

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- Option : A
- Explanation : The first letters form a series of C, D, E, F, G and so on. The second letters form a series of K, L, M, N, O and so on. The third letters form a series of Z, Y, X, W, V and so on.

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- Option : D
- Explanation : The first letters form a series of N, O, P, Q, R and so on. The second letters form a vowel series, and the third letters form prime number series according to their number position.

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