Answer:A
Explanation: If you’re constantly worrying about contaminations you’ll clean
I think (C):600
Explained: other sources say there is about 650 but if you count the muscles within a complex muscle then about 840
"Benefit her health" means which would be good for her body. So how could taking a bus, being driven, or taking a cab be good for her health? Riding a bicycle is the only way she can get any physical activity on the way to school.