一道关于Navigation law的题目

mangostUID: 3942002

Paragraph 3
The Navigation Acts also barred the export of certain “enumerated goods” to foreign nations unless those items first passed through England or Scotland. The American mainland’s chief items of this sort were tobacco, rice, furs, indigo (a Carolina plant that produced a blue dye), and naval supplies (such as masts and tar). Parliament never restricted 【grain, livestock, fish, lumber, or rum】, which altogether made up 60 percent of American colonial exports. Furthermore, Anglo-American exporters of tobacco and rice—the chief commodities affected by enumeration—had their burdens reduced by two significant concessions. First, Parliament gave tobacco growers a monopoly over the British market by excluding foreign tobacco, even though this hurt British consumers. (Rice planters enjoyed a natural monopoly because they had no competitors.) Second, Parliament tried to minimize the added cost of landing tobacco and rice in Britain (where customs officials collected duties on both) by refunding the duties on all tobacco and rice that the colonists later shipped to other countries.


6.        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


参考答案是D，但我并读不出这个意思，文中提及这些东西占60percent，但没有说明或暗示这是为了compensate。
我选的是A，前句说xxx受限，这句说xxx不受限，故作者是想清楚地告诉读者那些商品出口受限。


希望能知道大家的意见。

mangostUID: 3942002

另外，我觉得这道题是答案错了

Paragraph 1
In the seventeenth and eighteenth centuries, the British parliament enacted a number of laws, called Navigation Acts, governing commerce between Britain and its overseas colonies. For example, the Navigation Acts of 1660 and 1663 barred the empire’s colonial merchants from exporting such commodities as sugar and tobacco anywhere except to England and from importing goods in non-English ships. Similarly, the Molasses Act of 1733 taxed all foreign molasses (a thick liquid drained from sugarcane and used to make rum) entering the mainland American colonies at sixpence per gallon. This act was intended less to raise revenue than to serve as a protective tariff (tax) that would benefit British West Indian sugar producers at the expense of their French rivals. By 1750 a long series of Navigation Acts were in force, with several effects on the North American colonial economy.

1. According to paragraph 1, the Navigation Acts of 1660 and 1663 did not allow
A        importing goods without paying taxes on them
B        importing goods made outside the British Empire
C        using English ships to transport goods to non-British colonies
D        using non-English ships to bring in goods from outside the colonies

参考答案是B，但是
1. 字面就是 in Br ships 使用不列颠船
2. 最后一段说到了
enabled colonists to consume ... items both produced in Britain and imported by British and colonial merchants from elsewhere. 所以也可以从其他地方进口
3. 印象中Navigation law确实是针对船说的


所以大家遇到答案感觉不对的频率频繁吗