A firm handshake communicates confidence , not the nervousness, due to the various sources.
And in the US you are supposed to give a decent firm handshake to make a good impression.
So I wold pick A. from the given choices
Are there only 3 choices? something like it communicates confidence - would be a better choice.............
"Science backs up what the etiquette books have been saying all along: A
firm handshake helps make a good first impression for both males and
females. A July 2000 University of Alabama study found that consistent
with the etiquette and business literature, there is a substantial
relationship between the features that characterize a firm handshake
(strength, vigor, duration, eye contact and completeness of grip) and a
favorable first impression. "