TOEFL Listening: ETS-TOEFL听力机经 - 16LFQDN41WMCTT36P$

Why does the professor mention the mercantilists of the 17th and 18th centuries? A. To explain how the idea of buying stock in companies came about. B. To refer to who first identified the need for regulation of international trade. C. To explain how international trade expanded to include stocks and bonds. D. To point out the origin of the negative attitude towards trade deficits.