The correct answer is A.
Based on this excerpt from Chapter 3 of "The Scarlet Letter", the best explanation to why Mr. Dimmesdale’s speech to Hester Prynne is so moving to the audience is that his voice is so sweet an rich that it caughts the listeners attention and produces a sense of sympathy.
It is the young pastor's voice that captivates the audience rather than the words he is speaking. Its voice "rings out clearly and brightly" which causes listeners to inevitably emphatize.
