Step 1: Observe the pattern in the series
Each term in the series follows a pattern of alternating letters:
- First letters: Y, W, U, S, (?)
- The sequence of first letters is shifting one letter forward in the alphabet each time: Y → W → U → S → Q.
- Second letters: E, F, H, K, (?)
- The sequence of second letters is increasing by 1 each time: E → F → H → K → O.
- Third letters: S, D, G, I, (?)
- The sequence of third letters is alternating every few letters: S → D → G → I → L.
Step 2: Predict the next sequence
Using the established pattern, the next term should be QOL, where:
- First letter Q follows S.
- Second letter O follows K.
- Third letter L follows I.
Step 3: Final Answer
The correct answer is (a) QOL.
Final Answer: The correct answer is (a) QOL.