Is a benefit of better cardio-respiratory endurance A. Increased flexibility. B. Larger arteries that are able to carry blood throughout the body. C. Increased lean mass. D. Stronger muscle?

The correct answer is B: Larger arteries that are able to carry blood throughout the body.

Improved cardio-respiratory endurance leads to increased stroke volume, which means the heart pumps more blood with each beat. Over time, this can cause the arteries to enlarge, allowing them to carry more blood and oxygen to the muscles and other organs.