Walter owes Christine $100. Walter does not have the money and does not think he will anytime soon. After discussing the matter, Christine agrees to take $50 as full repayment. The parties sign a written agreement and Walter pays Christine $50. Under the common law, can Christine sue Walter to collect the remaining $50?

a.) Yes, because Christine provided no consideration for the new agreement

b.) No, because Christine is bound to the new terms she agreed to

c.) Yes, because Walter provided no consideration for the new agreement

d.) No, because Walter completely performed his obligations under the contract

e.) Maybe, but only if Walter was about to enter bankruptcy