6. The following statements describe when your body system is at work EXCEPT ONE

A. Your digestive system is at work when you hear your stomach growling before recess
B. Your muscular system is at work when you faint after running around the field during
PE
C. Your skeletal system is at work when you run as fast as you can in an oval during the
fun run
D. Your circulatory system is at work when you hear your heart pumping before you sit
for an examination​