TOEFL Reading: ETS-TOEFL阅读机经 - T4W_L95VT3YR3897L$

The phrase "this hypothesis" in the passage refers to the idea that A. there was competition for territory between Mesolithic hunter-gathers and invading Neolithic farmers B. a population explosion brought about a division of the region's Neolithic farmers into neighboring groups C. the need of neighboring groups to define their territories led to the construction of megaliths D. the construction of megaliths was a way of competing for farmland