TOEFL Reading: ETS-TOEFL阅读机经 - 8P2QS71YD7ZBP363L$

In paragraph 3, why does the author discuss the results of radiocarbon dates A. To support the idea that megaliths spread rapidly during the Bronze Age B. To question the idea that megaliths have a religious origin C. To provide evidence against the theory that Bronze Age Aegeans inspired the megaliths D. To argue that the megaliths in Brittany are older than the megaliths in Los Millares