TOEFL Reading: ETS-TOEFL阅读机经 - C486695A363C5G36L$

The author mentions "grain, livestock, fish, lumber, or rum" in the passage in order to A. indicate the colonial exports that were affected by enumeration B. provide examples of important commodities that had not been allowed to be exported before the Navigation Acts were introduced C. explain why Britain decided to introduce the Navigation Acts D. show how North American exporters quickly increased the exports of certain products to compensate for the restrictions imposed by the Navigation Acts