Please have the entire question so we can answer it.
Answer:
D, all of the above
Explanation:
Each and every one of these are extremely important to the body. Hydration is key, exercising in extreme temperatures without preparing can easily lead to heat exhaustion or heat stroke, and when, how, and where can determine wether or not you increase the risks of getting injured.
Texting and driving because the motorists takes their eyes off the road and realizes that they have to stop at the last minute.