The sincerity of a speaker adds to the speaker's
a. emotional appeal.
b. ethical appeal.
c. verbal appeal.
d. appeal to reasoning.

I believe that the sincerity of a speaker often most directly adds to the speaker's

(A) emotional appeal.

The sincerity of a speaker essentially refers to speaking without deceit, and without honesty. And therefore if a speaker is sincere, it would add to his/her emotional appeal.

it's like watching a fable, it's not really about the animals but rather it has a meaning that is understood by us and that is implicit, not explicitly said. implicit ideas are common and are used in almost all works of art, from writing to painting to sculpting.