TOEFL Reading: ETS-TOEFL阅读机经 - P6F7853KL301NIA6L$

According to paragraph 2, the Navigation Acts had all of the following effects on the northern colonies in North America EXCEPT: A. The region's economic dependence on Britain declined. B. The region's ports became increasingly busy. C. Shipbuilding and related industries grew in strength. D. Ownership of vessels by merchants in the northeast and mid-Atlantic colonies declined.