When on a weight-gain diet, untrained men tend to initially gain about of muscle per month, and 20 pounds or more per year.
a. 5
b. 4
c. 3
d. 2

The correct answer is letter D. When on a weight-gain diet, untrained men tend to initially gain about 2 pounds of muscle per month, and 20 pounds or more per year. This is because there is more area in the body available for muscle growth that's why muscle fibers are easily developed and recruited to perform muscle contractions.

A.children playing educational games

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