Patricia and Charlie Entered into a Written Agreement

Patricia and Charlie entered into a written agreement. Patricia promised to pay $5000 to Haden, who is Charlie's brother. Charlie placed his seal on the document, but Patricia did not do so. Three days later, Charlie promised that he would design a new computer program for Bethany, Patricia's sister, in exchange for Patricia's promise. Which of the following statements is the most accurate?

A) Patricia must pay $5000 to Haden if Charlie actually does design a new computer program for Bethany.
B) Patricia's promise is not enforceable because each party to a contract must provide a benefit to the other party.
C) Charlie's promise is enforceable because it was given in exchange for Patricia's promise to pay $5000.
D) Patricia's promise is not enforceable because it was not given in exchange for consideration.
E) Patricia's promise is enforceable because Charlie placed his seal on his agreement with her.