You should stop so you don't do serious damage.
The answer is C, To save lives, prevent injuries, and protect the health of America's workers.
Ads?? Newspaper?? A friend??
Dangerous conditions influencing sport injuries include all answers which you've mentioned (overuse, overexertion, and incorrect technique). It doesn't, however, include practicing and drills - d.
Practicing and drills is the thing which would help us become more profficient at a certain task and eventually sport through it.
