Which Argument Is True About Chinese Renminbi

Which argument is true about Chinese Renminbi?

A) is preferred currency for international trade accounting for over 50% of all foreign trade settlements
B) is traded under fixed regime on China Onshore Market, but floating on its Hong Kong Offshore Market
C) is traded at the moment under managed float within +/- 1% against the US dollar parity rate set by People's Bank of China
D) has been constantly depreciating against the US dollar over the last 20 years