Which of the following is a social group?
a. a couple married less than one year
b. everyone in your sociology class who has brown hair
c. people waiting at terminal c for the flight 181
d. passengers on the flight 181
e. all of the above

The following is a social group:

Explanation:

The group of human beings that interact with each other and share the same objective is called a social group. The members of this group, therefore, have something in common that leads them to fulfill a certain role in society.

For a social group to exist, the group must have an identity that allows it to distinguish itself from other groups and that provides a sense of belonging to its members. Thus the member is recognized as a member of the social group and acts accordingly.

A family is an ideal model that serves to designate a particular social group that, despite presenting itself with different forms and characteristics, has always served as the basis for the organization of social systems.

Small groups can be:

the minoans were group of people living in the greek islands of crete in the mediterranean sea during the bronze age

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.