What is the most logical next event?

The bike chain is fastened back together on the bike gears using a specialized tool. The person inspects the newly replaced chain by hand. the person

OPTIONS: (A). points to different areas on the bike gearing with the bike on the rack after the job is complete.. (B). then takes down the new chain.. (C). then removes the new chain and remounts the bike.. (D). fixes the old chain onto the wheel link bike..
(A).