How Has China Explained Its Growing Bilateral Imbalance with the United

How has China explained its growing bilateral imbalance with the United States?

A) Current accounting practices make it very difficult to determine the value-added and true national origin of goods.
B) If the United States would only improve its efficiency, there would be no gap.
C) Most Chinese imports are cheap consumer goods, and no firm in the United States wants to make those things anyway.
D) China continues to struggle with corrupt officials at the customs bureau.