Biceps branchii and triceps branchii are

Antagonistic muscles

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Adductors

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Abductors

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Complementary muscles

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Solution

The correct option is C Antagonistic muscles
When one muscle opposes the action of another, they are called antagonist's muscles. For example, biceps and triceps are antagonistic muscles. One of them contracts the body while the other relaxes it. Biceps pull the muscles of the forearm while triceps push those muscles.
So, option A "Antagonistic muscles" is the correct answer.

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