How do archaeological finds in Cactus Hill, Meadowcroft, and Buttermil

How do archaeological finds in Cactus Hill, Meadowcroft, and Buttermilk Creek complicate our understanding of the origins of human habitation of the Americas?

A) They suggest that the first humans may have arrived in the Americas 50,000 years ago.
B) They suggest that the first humans to arrive in the Americas may have been European.
C) They suggest that the earliest arrivals in the Americas arrived by boat.
D) They suggest the existence of immediate predecessors to the Clovis people.

ANSWER
B