Answer:
The correct answer would be option B.
Step-by-step explanation:
Warm up and cooling down are considered the essential parts while doing exercise or workouts. This is because, the muscles in the body need time to get prepared for the work out during warm up and need time to cool down or relax after workout. So option B explains this phenomenon better as, Making time to warm up/cool down, gradually activating muscles groups to efficiently acclimate to the intended activity parameters, and slowly increasing and decreasing the training heart rate is important for heart health and efficiency.