Q: Which of these constitute a motor unit?  

Answer: A

A motor unit is a functional unit of a muscle consisting of a motor neuron and the muscle fibers it innervates. When the motor neuron fires an action potential, all of the muscle fibers in the motor unit contract. Therefore, muscle fibers connected to a motor neuron make up a motor unit. Fascia is a type of connective tissue that surrounds muscles and other organs, but it is not directly involved in motor unit function. Similarly, a muscle bundle is a group of muscle fibers surrounded by connective tissue, but it is not a complete motor unit.

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