Answer:
A. He had a right to vote for the candidate he believed in.
Step-by-step explanation:
As given in the question, the word "right" has so many meanings out of which one is "to be legally and morally entitled". And in this sense, we can safely say that the sentence we are supposed to get among the given options will contain the right meaning as given in the question.
Among the four given options, the sentence that contains the correct answer for the "morally and legally entitled" meaning for the word "right" is the first sentence. In this sentence, the "right to vote for the candidate he believed in" is a "legal and moral right" that an individual is endowed or have access to which no one can take away.
So, the correct answer is option A.