Correct option is A
The grammatically correct sentence is (a) Only I is correct.
· I correctly uses "but" to introduce a contrast without redundancy.
· II incorrectly uses "yet though," both being conjunctions showing contrast, making it redundant.
· III incorrectly combines "though" (contrast) and "since" (reason), leading to logical inconsistency.
Grammatical Rule Used:
· "But" and "yet" are contrast conjunctions; only one should be used, not both together.
· "Since" shows cause/reason, not contrast.
Example:
· Correct: He enjoys music, but he dislikes dancing.
· Incorrect: He enjoys music, yet though he dislikes dancing.
Information Booster:
· Avoid double contrast conjunctions together like "but yet," "though yet," etc., as it leads to redundancy and confusion.