The answer would be A. Heart Failure.
I would say hat now is the perfect time because peak bone mass happens at our age. Bone strengthening exercises are always good for your body no matter what, so encourage her/him to do it. I'm guessing the age is about 11-18 maybe...
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I think it is true because people can talk about anything but it is what is discussed that matters
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It is a BC when its hot you dihyrate more than usual