Someone Who Has Broken an Arm and Has Had a Cast

Someone who has broken an arm and has had a cast on it for months will notice a distinct shrinking of the arm once the cast is removed.Why does this happen?

A) The cast has reduced blood flow to the muscle tissue to reduce swelling.
B) If the muscles are not used they will atrophy.
C) The other arm was used more to compensate for the unused one, and it's become stronger.
D) If the person was right-handed, they'll become left-handed.

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