Which of the Following Statements Is TRUE

Which of the following statements is TRUE?

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