In Which of the Following Situations Would the Effect of Illegality

Multiple Choice

In which of the following situations would the effect of illegality be an exception?

A) when both parties of an illegal contract execute their agreements
B) when both parties of an illegal contract are considered in pari delicto
C) when a party is justifiably ignorant of the law or fact that made the contract illegal
D) when a party completes his act of an illegal contract but has not received consideration