What components constitute a motor unit?

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A pair of muscles consisting of a flexor and an extensorOne skeletal muscle along with every motor neuron that controls itA single motor neuron together with all the muscle fibers it activatesEvery motor neuron that responds following maximal stimulation of a single sensory nerve

Explanation

A motor unit consists of one motor neuron and all the muscle fibers it innervates. It does not include pairs of muscles or all motor neurons controlling a muscle. Therefore, option C correctly defines a motor unit.