What Would Be the Best Reason for Supporting the Validity

What would be the best reason for supporting the validity of age being considered a subculture?

A) People of the same age have similar religious beliefs.
B) People of the same age have shared the same experiences and have common memories.
C) People of a certain age share the same genetic traits.
D) Age has been traditionally thought of as a subculture and consumer behaviourists have seen no reason to modify that long- standing belief.
E) Age is a subculture because of the definitions adopted by Statistics Canada.