21. A PROMISE WHICH IS UNSUPPORTED BY CONSIDERATION IS NONETHELESS ENFORCEABLE IF: (A) THE PROMISOR CLEARLY INTENDED TO BE BOUND BY IT WHEN HE MADE IT (B) THE DOCTRINE OF PROMMISORY ESTOPPEL IS APPLICABLE TO IT (C) THE PROMISE IS IN WRITING (D) THE PROMISEE RECEIVED A BENEFIT (E) NONE OF THE ABOVE