Which of the Following Is Typically Not a Possible Disadvantage

Which of the following is typically not a possible disadvantage of a tournament?

A) Competitors have little incentive to help one another (and they may even sabotage each other's work) .
B) Workers rarely understand all of the rules to a tournament.
C) A large prize can encourage workers to provide effort until the very end of the tournament, even if the worker has a small chance of winning.
D) Workers may collude to share the prize in order to provide lower levels of effort.
E) The outcome of a tournament may appear to be random.