Answer:
a. subcultures
Explanation:
A subculture is a culture within a larger culture that has beliefs and norms different from the larger culture.
The old order Amish and the youth culture are both subcultures in the United States. The Old Order Amish are a group of traditionalist churches known for plain dressing and simple living. The youth culture describes the way children,teenagers and young adults live such as their norms and common practices.