Establish the guidelines or standards for determining what one should do, how one should act, what type of person one should be.
a. roles
b. attitudesc. norms

Norms

Explanation:

Social norms are called common expressions of normal group behavior and also personal views of specific group behavior. They can be interpreted as cultural practices (including beliefs, practices, and traditions) that reflect basic understanding about what others do and what  others ought to do.

The functions of standards are stressed in the context of social philosophy— which can direct actions in a given scenario or setting as "external images of proper behavior." It has been said that positive attitudes can encourage pro-social behavior, like decreased drug consumption, increased turnout of electors and reduced energy usage.

C. Norms establish the guidelines or standards for determining what one should do, how one should act, what type of person one should be.

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