Sociologists say that norms are situational because

From a sociological perspective, social norms are informal understandings that govern the behavior of members of a society.

Explanation:

your word would be isle.

isle is an island or peninsula especially a small one.

if you add the letter "a" you get aisle, which is a passage between 2 rows of something like chairs, shelves, or something else.

it is c) 24hrs

hope i !