Reba Was Appointed as Administrator of Her Father's Estate

Reba was appointed as administrator of her father's estate. She orally promised Mintz, a creditor of the estate, that if there were inadequate funds in the estate, she (Reba) would pay the debt from her personal funds. To be enforceable, the agreement must be

A) in writing.
B) for debts over $500.
C) for debts for personal property only.
D) for a period of less than one year.