The united states canada’s exports.

pays higher prices for

buys almost all of

imposes high tariffs on

buys very few of

C. imposes high tariffs on

Explanation:

The trade between America and Canada had been on the rise because of the implementation of different types of taxes. The reason of the duties, therefore, is to control exploitative of the products and controls the imports and exports. The reason for this, therefore, is to protect the economy of the regions. Canada is the leading in trade because of the limitation of taxes in some commodities. For instance, commodities whose consumption is high are not imposed with the tariffs. This, therefore, increase its surplus production both in America and Canada.

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.