Answer: D) norms
Explanation:
Norms are ACCEPTED ways of doing things in a society or social circle. It is usually internalized and with no need for reinforcement but sometimes can be reinforced through positive or negative sanctions.
It is important to learn the norms of a new social cycle as Karen is doing so as not to stick out or annoy the occupants of the social cycle.
When people say, "When in Rome, behave like the Romans", that is akin to saying that one should adopt the norms of the people in Rome whilst in Rome, or adopt the norms of the people of Alaska when in Alaska and so on.