All of the Following May Bar Someone from Obtaining an Equitable

All of the following may bar someone from obtaining an equitable remedy EXCEPT

A) if the plaintiff himself did not have "clean hands".
B) if no attempt was made by the defendant to mitigate damages.
C) if to do so would affect an innocent purchaser.
D) if there were unreasonable delays in taking the other party to court.
E) if the plaintiff is a minor and the contract couldn't be enforced against him.