This is a test of commonsense with single/multi-choices. Complete the next sentence:

A man sits on a rowing machine in a gym and talks to the camera while demonstrating how to use a rowing exercise machine. the man

Choices: (A). looks to the camera and gives a thumbs up.. (B). begins to exercise on the machine slowly, all while talking to the camera, eventually building up to a more fast paced work out on the same machine.. (C). adjusts the using of a direction lever in a rowing machine.. (D). demonstrates the moves way a person performs and annoys while talking..
The answer is:
(B).