"When in Rome,do as the Romans Do" Is an Approach

"When in Rome,do as the Romans do" is an approach to dealing with culture that

A) will keep you on the straight and narrow because it works.
B) will never work because, unless you are Roman, you won't fit in.
C) violates what we know about culture because it relies on subjective perception.
D) is dangerous because such relativistic approaches lack a fundamentally ethical basis.