What does the professor imply when she mentions a debate about when the Clovis people arrived in the Americas? A. An arrival date of 11,000 years ago is acceptable for the purpose of her lecture. B. An arrival date of 11,000 years ago is inconsistent with some aspects of Clovis culture. C. Only a few archaeologists believe the arrival date is much earlier than 11.000 years ago. D. The debate about the arrival date of the Clovis people has recently been settled.