Which statement about metabolism is true according to the material?

• A. The rate does not change with age or activity
• B. More physical activity speeds up metabolism
• C. The rate speeds up with age but slows with activity
• D. The rate slows with age but speeds with activity

Answer: (C)

Metabolism is the body's rate of using energy for all its daily processes. According to the material, this rate speeds up with age and slows with activity. Think of it as a simplified view where growth and development during aging push energy use higher, while increasing physical activity is described as making the body more efficient, leading to a slower resting rate. In this context, that combination is presented as true, so the statement aligns with the material’s wording.