A US Presidential Candidate's Acceptance Speech at the Party Convention Greatly

A U.S. presidential candidate's acceptance speech at the party convention greatly influences the way in which many voters see the candidate. Who was most likely to have a more favourable opinion of Senator Obama after his speech at the 2008 Democratic National Convention?

A) Zora, who had been an Obama supporter since he announced running for President
B) Yancey, who is a fervent Democrat but doesn't know much about Obama
C) Xenia, who became a strong Obama supporter after rival Hillary Clinton dropped out of the race
D) Will, who was a supporter of rival John McCain but intensely disliked his negative campaign