TOEFL Reading: ETS-TOEFL阅读机经 - 5R7Z3OD1CUZXXA5KL$

In paragraph 5, the author mentions the transport innovations of the carrack and Hesse carts in order to A. provide examples of wartime inventions that were adapted for use in industry B. explain how knowledge of more efficient organizational forms was spread C. provide reasons for the decline in transaction costs D. identify innovations that led to falling interest rates