Write the next sentence in the following story.

Next he screws on some screws to have them ready. He then slides on the grips onto the handles of the bike. he

[a]. then grabs more rollers and screws the bike together on the backs.;
[b]. tightens the handles till they form.;
[c]. is then instructing the camera then cutting back to the hillside bike.;
[d]. completes the tightening of the grips with an alan wrench.;. The answer should be
[d].