Question

Practices by a certain group of people

Answer 1

Answer:

Practices by a certain group of people is known as : A. Customs

For example, it is a custom in Japan to bow down when you introduced yourself to someone at the first time. 

Custom tend to be only applied to a specific group of people. If a member of that group of people failed to follow the custom, he/she tend to received social punishment such as social exclusion