What makes your bones move up and down?

Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.

You can literally find this on google of each science career and search up what type of training you need and how many years in school

Iwould say a is correct