D. oxygen,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
I believe the answer for your question is C
1 be heard. 2. true. 3 responsible
To treat muscle cramps, it is important to relax the muscle. Stop any activity and stretch gently the muscles and to hydrate your body. Also, if muscle cramps is a regular occurrence then it is recommended to add more magnesium in the diet. <span />