Part C has an error. In part C, the conjunction 'unless' contradicts the context of the sentence as the sentence by itself indicates that the subject might not have got a specialized degree if the subject failed to choose India. 'Unless' (except if (used to introduce the case in which a statement being made is not true or valid)) is an unnecessary word to the context of the sentence.
The correct answer is: I would have never been able to get a specialised degree if I would have not opted for India.
Hence, the correct answer is option (d).
Note:
CONJUNCTIONS
A conjunction (also called a connective) is a word such as and, because, but, for, if, or, when etc. Conjunctions are used to connect phrases, clauses, and sentences.
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