Answer:
a.counterculture.
Step-by-step explanation:
In sociology, counterculture is defined as one of the subcultures whose norms and values related to behavior differs significantly as compared to that of other mainstream societies, and mostly to the opposite of the cultural mainstream. It is considered as a movement of protest that is being carried out by the youth of America and occurs during the 1960s.
Example: The green movement, feminist groups, hippie movement, and polygamists, etc.