Q: What is the key factor in making muscles strong?  

Answer: D

Consistent exercise is the key factor in strengthening muscles. When you exercise, your muscles are placed under stress which causes microscopic tears in the muscle fibers. As these tears heal, the muscle fibers become stronger and thicker, resulting in stronger muscles overall. Additionally, exercise helps to increase blood flow to the muscles, providing them with the necessary nutrients and oxygen they need to grow and repair. While diet and sleep are important for overall health and muscle recovery, exercise is the most effective way to increase muscle strength.

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