"Using physical gestures to emphasise the points" is the rhetoric device used in speaking.
Option (c);
EXPLANATION:
Rhetoric device is a technique of speaking in which one tries to persuade others by their speech. The other person is convinced by evoking their emotions through speech. It is a very effective type of device to give a logical or emotional appeal.
Among the options, the third statement explains the physical parameters that frame key-points in speaking. Also, while the other statements are using a metaphor, appealing the audience's sense of humour and organising thoughts into a logical pattern is done in writing as well. Thus the third statement justified the effective way of speaking.