![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Overt collusion is relatively rare because:
A.
they are illegal in some countries, including the United States.
B.
members find it difficult to agree on key decisions.
C.
members frequently have an incentive to cheat on the cartel.
D.
of all the above reasons.