The First sentence is where the quotation is used correctly- quotations is used with the titles of literary works and not with the name of the writers.
The scientists are working to find a cure
<span>The answer is letter C which is their. To complete the statement "Which pronoun agrees with the antecedent in the sentence Will each of the candidates share their thoughts. "Their" is a word that takes the place of a candidates, it will be redundant if you use letter B, theirs because thoughts is already ending with "s".</span><span />
