TOEFL Reading: ETS-TOEFL阅读机经 - 3LNN4I2TKL5T695JL$

According to paragraph 6, what led to the development of the first banking techniques A. Merchants from different European regions needed to compare the value of their currency at large markets. B. Merchants participating in large markets wanted a place to safely store the money they made from their sales. C. Organizers of large markets developed methods for determining the value of goods from long-distance traders. D. Merchants needed to borrow money to buy the goods of other merchants at large markets.