问题：
[单选题] Text3 Mention price cartels and many people will think of big,overt ones like the one OPEC runs for oil and the now-extinct one for diamonds.But at least as damaging are the many secret cartels in suc
A、More tougher enforcement can be made.
B、Let companies operate in cross trade condition,
C、The mechanism of rewards whistleblowers.
D、Wiser measures can be provided.
参考答案：
C、The mechanism of rewards whistleblowers.
● 参考解析
