Pretty sure the answer is D
A ressponsible, mentally stable adult.
The pathogen is a location where a disease- causing organism can survive
<span>a group of people, usually of similar age, background, and social status, with whom a person associates and who are likely to influence the person's beliefs and behavior.
Hope It Helps:)</span>
I would say A...just because when it comes to flexibility everyone is different.
Hope this helps!!!