TOEFL Reading: ETS-TOEFL阅读机经 - 7N6R5AYGI116Z8DWL$

According to paragraph 3, what role did horses play in the larger social changes of the eleventh century? A. The raising and selling of horses became important economic and cultural activities in Europe. B. Horses stimulated the growth of urban areas by providing quick, reliable transportation. C. Owners of successful horse-based farms became influential member of society. D. Horse transportation enabled Europeans to interact with other cultures like those of Central Asia.