What happens next in this paragraph?

A man demonstrates how to do a squat bench, raising weights as he squats down and propels forward. the trainer
Choose your answer from: (A). talks about proper form, showing how to keep legs and arms apart.; (B). removes and replaces his black yoga pants and holds up his abdomen.; (C). talks about how this helps to take care of loose or uneven bench.; (D). demonstrates on a bench how to stand up and bend backward in a squat like position.;
(A).