Choose the missing terms out of the given alternatives : Y, W, T, P, K, E, X, ?, ?

The correct answer is C. R, G.

The sequence is a simple alternating repetition of the letters Y, W, T, P, K, E, X, R, G. The first letter of each pair is repeated, and the second letter of each pair is the next letter in the alphabet.

Option A is incorrect because G is not the next letter in the alphabet after P.

Option B is incorrect because P is not the next letter in the alphabet after K.

Option D is incorrect because S is not the next letter in the alphabet after X.