Which of the Following Is an Exception to the General

Which of the following is an exception to the general rule that rights to a contract cannot be assigned when a contract is personal in nature?

A) When the only part of a contract left to be fulfilled is the payment.
B) When the sale of goods is involved.
C) When no more than half the contractual duties have been performed.
D) When no more than three-fourths of the contractual duties have been performed.
E) When at least one-third of the contractual duties have been performed.