The School Nurse Reminds the 8th Grade Boys' Physical Education

The school nurse reminds the 8th grade boys' physical education classes to make time for warm-up exercises and stretching before strenuous physical activity because:

A) warm-up exercises allow for a more proficient performance.
B) bones are growing faster than muscles and tendons and may result in injury.
C) the body's circulating blood needs warm-up time to perfuse larger frames.
D) warm-ups give an opportunity for perspiration to cool overheated muscles.