Answer: B is the answer.
Explanation: Disinfecting a surface is cleaning off dirt and germs. When you use soap and water to remove dirt, your disinfecting it the surface, meaning your cleaning off the germs so you and your family or peers don't get sick.
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Out of the choices given, to ensure that Rachel properly applied all the necessary FITT principles to her plan, she needs to add more cardiovascular training to her exercise routine and eat several low-calorie meals throughout the day. The correct answer is A.