Which of the Following Statements Is TRUE

Which of the following statements is TRUE?

A) As a general rule, a promise to perform a pre-existing public duty can provide consideration for a new contract.
B) As a general rule, a promise to perform a pre-existing contractual duty to one party cannot provide consideration for a new contract with a different party.
C) As a general rule, a promise to perform a pre-existing contractual duty to one party can provide the consideration for a new contract with that same party for a lesser contractual duty.
D) As a general rule, a creditor's promise to accept a lesser sum in complete discharge of a larger debt is unenforceable.
E) As a general rule, a promise that is not supported by valuable consideration is enforceable only if both parties have applied their ceremonial wax seals.