What is the most logical next event?

Alongside her is the pro fitness expert who is demonstrating how the machine works. He shows the buttons that need to be pressed in order to start the elliptical. after he

OPTIONS:
A). gets the machine started, the lady hops onto the machine and begins using the elliptical.
B). has shown what he will do, he quickly compares the controls that are on the machine with the buttons on the elliptical.
C). demonstrates the mechanics, time is measured to ensure the machine does not fail.
D). finishes, he is shown jumping on the form, showing his balance, strength and how to gear up.
A).