Which statement is correct about the relationship between bones and muscles?
a muscle can both push and pull a bone, causing it to move.
a muscle can only pull a bone, so moving a bone back and forth requires the action of at least two muscles.
bones can move without the aid of muscles.

Based on the options given, the most likely answer to this query is 
A muscle can only pull a bone, so moving a bone back and forth requires the action of at least two muscles.

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The answer is A, I think because I learned this in the middle of school. just go and check out in Google

answer:

answer is c

body systems are made up of organs