The answer is B: fat gives your body energy to function, while muscle mass is used only to perform strenuous activity. This option is only correct because the statement includes the words, "muscle mass." If it was only "muscle," then it would be wrong.
The answer cannot be A because weight should definitely be considered when discussing overall health.
The answer cannot be C because muscle weighs <em>less</em> than fat, but it is healthier.
The answer is not D because body protection does not occur from the amount of fat a person has.
It will be most appropriate to assign the patient to a room with roommate having the same MRSA case in the urine and importantly the roommate is not bedridden, that is, the he or she is ambulant