After the accident, the nerves to her arm were damaged and so the muscles ____ through disuse.
Answer: B
Correct answer: atrophied
Damaged nerves mean the muscles cannot be used, and through disuse names the cause directly. Muscles that are not used waste away, which is what atrophy means.
Invigorated is the opposite of what disuse produces. Elongated and contracted describe changes in length rather than in bulk or strength, and neither is a consequence of not using a muscle.
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