What Is the Effect of China's Alleged Currency Manipulation That

What is the effect of China's alleged currency manipulation that keeps the value of its currency artificially low compared to the U.S. dollar?

A) It makes Chinese exports to the U.S. less expensive.
B) It makes U.S. exports to China less expensive.
C) It creates a nontariff barrier to U.S. exports to China.
D) It limits U.S. investment in China.