Assuming That Goods Are Nonconforming and That the Nonconformity Substantially

Assuming that goods are nonconforming and that the nonconformity substantially impairs their value to the buyer,which of the following additional factors must be present for a valid revocation of the acceptance of goods?

A) Nothing else is needed.
B) The goods must have been accepted before the nonconformity was discovered,and the nonconformity must have been difficult to discover.
C) The goods must have been accepted on the reasonable assumption that the seller could and would cure the nonconformity.
D) Both B and C are required to revoke the acceptance of the goods.
E) If either B or C is present,the acceptance of the goods can be revoked.