Which statement about muscle mass is true?

• A. It reduces bone density
• B. It decreases metabolism
• C. It builds muscle mass
• D. It lowers cholesterol

Answer: (C)

Building muscle mass happens when you do resistance training because muscles adapt by getting bigger and stronger. That increase in lean muscle tissue is why the statement is true: muscle mass grows with the right stimulus, and more muscle tissue means your body becomes better at burning calories even at rest, since muscle is metabolically active. It also helps support bone health through the stresses of lifting, which is why increasing muscle mass isn’t linked to lower bone density. The other ideas don’t fit as well: increasing muscle mass doesn’t reduce bone density; it tends to help preserve or improve it. Also, adding muscle typically maintains or raises metabolism rather than decreases it. And while regular exercise can improve cholesterol levels, the direct, defining feature of muscle mass is its growth and the associated metabolic effects, not a direct claim about cholesterol.