Joints and ligaments a
are found in the brain.
b
make red blood cells.
с
let bones move.

C. let bones move.

Explanation: Because since joints and ligaments connect bones together in order to form a joint. The joints and ligaments both allow both the bones and tissues around the bones or just tissues to move and both are together to formed a joint which was said from above.

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note: for words found inappropriate, i spelled them out in the phonetic alphabet in parenthesis, so take the first letter of each word to get the word i was trying to spell