Which of the following is correct?
A. U.S. exports as a percentage of GDP have increased, but have not nearly doubled over the last 50 years. The U.S. currently has a trade surplus.
B. U.S. exports as a percentage of GDP have about doubled over the last 50 years. The U.S. currently has a trade surplus.
C. U.S. exports as a percentage of GDP have increased, but have not nearly doubled over the last 50 years. The U.S. currently has a trade deficit.
D. U.S. exports as a percentage of GDP have about doubled over the last 50 years. The U.S. currently has a trade deficit.