Over the past 40 years in the United States, as a percentage of gross domestic product:
A.exports have grown and imports have remained constant.
B.imports have grown and exports have remained constant.
C.exports have decreased.
D.exports and imports have grown.

Question

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The Answer of Over the past 40 years in the United States, as a percentage of gross domestic product:
A.exports have grown and imports have remained constant.
B.imports have grown and exports have remained constant.
C.exports have decreased.
D.exports and imports have grown.

Over the Past 40 Years in the United States, as a Percentage