Lucy orally agrees to clean Pig Pen's house for $110. When she finishes, a dispute arises over whether or not Lucy was supposed to have washed the windows and cleaned the oven. Pig Pen tells Lucy that he will give her $90 instead of the full amount. Lucy reluctantly agrees to accept the $90. Which of the following is true?

Group of answer choices

A. The $110 is a liquidated debt.

B. The $110 is an unliquidated debt.

C. The parties have entered into a collateral contract.

D. All of the above.

___________ promise is a promise which does not bind the promisor to any performance under the contract.

Group of answer choices

A. A liquidated

B. An illusory

C. A windowed

D. A material