I think it is C, since it sounds the most reasonable.
Very heavy perspiring or severe diarrhea can result in a serious reduction in the body's water content known as dehydration.
Tracking your flexibility over time as you train. There are no requirements on how flexible you need to be and there is no correlation of your length of life or muscle strength with how flexible you are.
The answer 1 is: True, the answer 2 is :false