The China Beijing International Mining Exchange （CBMX） is publishing a new iron ore pricing index， an attempt to better reflect supply and demand as well as reduce price volatility.

The China Beijing International Mining Exchange （CBMX） is publishing a new iron ore pricing index， an attempt to better reflect supply and demand as well as reduce price volatility.
A、difference
B、decline
C、unpredictability
D、compensation
正确答案：C