The correct option is D they restricted trade among the different British colonies in America.
The colonies, under the mercantilist policies of Britain, could
freely trade with each other, although not with the colonies of other
European powers (A). Under the mercantilist economic system, colonies
exist for the good of the mother country. To prevent competition with
the British, colonial production (B) was restricted by the Iron Act and
the Hat Act, and colonial shipping and commerce were restricted by
requiring colonial goods to go through British ports (E). These
restrictions led to resentment of British authority (C) and contributed
to the American colonists' desire for independence.