One Reason Collusive Oligopolies Are Usually Short Lived Is That

One reason collusive oligopolies are usually short lived is that firms participating in the collusion:

A) are unable to earn economic profits in the long run.
B) do not set prices where marginal cost equals marginal revenue.
C) set prices below long-run average total costs.
D) cheat on one another.
E) are unable to attain economies of large-scale production.