Which of the Following Statements Is True About Unliquidated Debts

Which of the following statements is true about unliquidated debts?

A) The amount being due and certain,a promise to pay less lacks consideration.
B) Some courts allow collection of the remainder if checks marked "payment in full" are cashed without reservation.
C) Since the amount is genuinely in dispute,an agreement resulting in accord and satisfaction is enforceable.
D) Composition agreements are an exception to unliquidated debts and can be enforced without additional consideration.