Choose the missing terms out of the given alternatives : Z, X, S, I, R, R, ?, ?

The correct answer is A. G, I.

The sequence is a simple alternating repetition of the letters Z, X, S, I, R, R. The first two letters are repeated, then the next two letters are repeated, and so on.

The first two letters in the sequence are Z and X. The next two letters are S and I. The next two letters are R and R. Therefore, the next two letters in the sequence are G and I.

Option B is incorrect because J is not the next letter in the sequence. Option C is incorrect because K is not the next letter in the sequence. Option D is incorrect because M is not the next letter in the sequence.