Supervening Illegality of the Object of a Contract Occurs in Which

Supervening illegality of the object of a contract occurs in which of the following circumstances?

A) The illegality existed when the offer was made.
B) The object of the contract is illegal where made,but would be legal in another location.
C) The object of the contract is illegal to be performed by the offeree,but could be legally performed by a different party.
D) The object of the contract was legal when the offer was made,but has subsequently become illegal.
E) The offeror had an honest and reasonable belief that the object of the contract was legal when the offer was made,but later learned that the offer was illegal.