Which of the following is NOT a type of norm?

The correct choice is based on the classification of social norms. Taboo, mores, and folkways are all established types of norms that govern behavior within a society.

Taboos are strong prohibitions against certain acts that are considered to be socially unacceptable or forbidden. Mores refer to the essential or characteristic customs and conventions of a community, often embodying the moral standards and ethical practices of a society. Folkways are the customary, habitual ways in which a group typically behaves, representing informal norms that guide everyday conduct.

On the other hand, a ritual is not categorized as a norm but is instead a series of actions or behaviors performed according to a prescribed order, often in a ceremonial context. Rituals may be influenced by norms, but they themselves do not dictate behavior in the same way that social norms do. This distinction is what solidifies 'ritual' as the correct answer to the question about which option is not a type of norm.