Answer:
Ways to fill 60 minutes
30-minute bike ride plus 30 minutes of free play (e.g. climbing trees, playing on the monkey bars, playing tag with friends) 60-minute basketball, volleyball, hockey, or soccer practice (assuming the practice is well organized and the kids are not simply standing around for long periods)
An author's credentials can determine a health source's credibility. None of the other options would apply to credibility. When it comes to health, if you want to make sure that what you are researching or reading is authentic and reliable you need to find out whether the author is a professional health expert or not. You can do this by finding out their credentials.
It leaves less of a risk of obesity
All of these do seem like possible injuries that could happen in sports the answer that makes the most sense to me is B since it seems like getting arthritis from sports injuries does not seem that common,
