What do artifacts such as shark teeth and shells found inside hopewell mounds tell us about their culture?

a. the hopewell lived by an ocean, where they could find such artifacts.

b. the hopewell most likely traded with other cultures throughout north america.

c. the hopewell placed little value on nonmetal objects, which could not be used for land modification.

d. the hopewell worshipped water gods, and used such artifacts to perform religious rituals.