Answer:
A. Increase the size of the muscle cells and the amount of blood that is delivered to the muscle
Step-by-step explanation:
In order to increase your muscular endurance, you need to participate in activities that increase the size of the muscle cells and the amount of blood that is delivered to the muscle.
Growth of muscle can occur by an increase in muscle cell numbers, muscle fiber diameter, and fiber length. As we exercise, our muscles grow. That's how they get stronger and their endurance increases. Besides that, the amount of blood that is delivered to the muscle increases. Muscles need more oxygen in order to function properly during exercise, and they generally function better as our circulation improves.