What happens next?

He then slides on the grips onto the handles of the bike. He completes the tightening of the grips with an alan wrench. last he

Choose your answer from: (I) pulls the handlebars of the bike up on the handle bars and goes after them after stopping. (II) pushes the bike over the smoothness of the foundation of the bike frame. (III) inserts plugs into the end of the grips and the handle bars. (IV) loosens the handles after tightening them.
(III)