Correct Response: D. Because of its rich soils, created over millennia by the annual flooding of the Connecticut River, the Connecticut River valley has long been the most productive agricultural region of Massachusetts. The Connecticut River valley also tends to receive more rainfall than central Massachusetts (A) or any other region of the state. The Berkshires (B) is a hilly, mountainous region with limited plains, and southeastern Massachusetts
(C) is a lowland region, none of whose rounded hills rise very far over the surrounding landscape.
