Why are muscle and fat levels the only factors influencing flexibility impacted by personal decisions?
a. muscle and fat levels are mostly determined by heredity.
b. age, gender, and joint structure cannot be changed.
c. personal decisions have significant impacts on age and gender.
d. flexibility is not dependent upon muscle and fat levels.

The correct answer for this item is option B. "B.Age, gender, and joint structure cannot be changed." This is a clear statement about a factual point of a different form but it also therefore leaves in place support for the idea proposed in the initial statement. At the end of the day muscle and fat are influenced by choices over what you eat and how you do or do not exercise.

The answer is B: Age, gender, and joint structure cannot be changed.