Mark Was Visibly Drunk When He Went into a Local

Mark was visibly drunk when he went into a local store and an aggressive salesman saw he was drunk and got Mark to buy a new expensive stereo system. The next day when Mark became sober he realized he could not afford it so he went to the store and said he wanted to cancel the contract. As a result a court would rule that

A) the contract is valid and if Mark does not pay he will be liable for breach of contract
B) the contract is void as he cancelled within the 10 day cooling off period
C) the contract is void as Mark lacked the capacity to contract
D) the contract is void as Mark was drunk at the time he made the contract
E) both C and D