In 2018, President Trump Passed a Series of Taxes on Imports

In 2018, President Trump passed a series of taxes on imports of agricultural, industrial, and consumer goods coming into the U.S.market from China as well as from allies, including the European Union, Canada, and Mexico.His actions marked a dramatic turn in U.S.trade policy because:

A) the country had signed, and the Senate had approved, many trade-oriented treaties with the countries Trump targeted.
B) the United States had, for half a century, led the world in advocacy of the lowering of trade barriers, including tariffs, in order to encourage free trade.
C) American companies had, for decades, preferred receiving subsidies over tariffs as a means of protection from trade pressures, before lobbying Trump for tariffs.
D) the United States had granted all of these countries "most-favored-nation" status, except for China, giving their exports preferential tariff rates.