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.

if this is a true or false question its true