Answer: the correct answer is C. Gesticulated. the whole phrase is: During his speech, the guest speaker gesticulated wildly with his hands, distracting the audience from the important points he was trying to make.
Explanation: Gesticulate means to use gestures, especially theatrical ones, instead of speaking or to emphasize one's words, e.g.
"they were shouting and gesticulating frenetically at drivers who did not slow down"
