Explanation:
everything can be found in the picture above. hope it helps.
Now that I think about it, it would be A and B because you need your bones for support and they also protect your organs. As for D it's the other way around your muscles help your bones move.
Well I'm not sure if I'm right but I believe that the answer is A
That would be 280 square feet per hour. 350÷1.25=280