In a 2016 Speech, Donald Trump Stated, "America Has Lost

In a 2016 speech, Donald Trump stated, "America has lost nearly 1/3 of its manufacturing jobs since 1997. Even as the country has increased its population - think of this - by 50 million people. At the center of this catastrophe are two trade deals pushed by Bill and Hillary Clinton." Which of the following statements is a true reason for the reduction in manufacturing jobs?

A) Trade agreements reducing barriers to trade are not associated with a reduction of manufacturing jobs in the United States.
B) The number of manufacturing jobs in the United States has declined for reasons that are unrelated to trade policy.
C) An increase in trade barriers will increase the number of manufacturing jobs in the United States.
D) The United States has a comparative advantage in low-skilled manufacturing, which trade agreements have encouraged.