D) Remaining well-hydrated while exercising is best.
Explanation:
Current Red Cross certification in first aid and CPR is effective for both instructors and assistant instructors who are serving with field labs. Red Cross gives a diversity of programs in most areas and so do local safety cabinets, clinics, and other institutions. Also, check with your campus' student excursions club, or equivalent. Usually, such companies arrange for first aid training for their heads, and such practice may focus more clearly than the Red Cross program on queries likely to be found in a geoscience field lab environment.
D. remaining well -hydrated while exercising is best, when you perspire from exercise you have to replace fluids or you will de-hydrate which is not safe.
