In Recent Years, the United States Has Accused China of Manipulating

In recent years, the United States has accused China of manipulating the yuan so as to gain an unfair competitive advantage in global trade.The United States has argued that China has

A) maintained an overvalued yuan that makes U.S. exports to China more expensive.
B) maintained an undervalued yuan that makes U.S. exports to China more expensive.
C) helped the yuan's exchange value to appreciate, thus making U.S. exports to China more expensive.
D) revalued the yuan by adjusting its part value upward, thus making U.S. exports to China more expensive.