In Which of the Following Situations Would the Courts Enforce

In which of the following situations would the courts enforce an oral agreement to pay extra compensation?

A) A builder promises to complete a contract on the date previously agreed upon if he is given extra compensation.
B) A police officer promises a neighborhood deli owner that, for a fee, he will keep a sharp lookout for burglars on the nights that he is on duty.
C) An accountant promises to complete an audit sixty days ahead of time if she is given extra compensation.
D) In no case will the courts allow the payment of extra compensation when the request is based on an oral contract.