Select from the following.
[a]. to move people
[b]. quadriceps
[c]. mechanical
[d]. critical organs
[e]. bones
[f]. heat or cold
[g]. joints
[h]. tendons
Given those answer options, answer the question: Fact 1: Muscles can only contract. Fact 2: Quadriceps contractions and leg raises are begun immediately. Given the two facts above, which are muscles?
A:
[b].