Which of the Following Is Enforceable Without Consideration

Which of the following is enforceable without consideration?

A) A new promise to pay a debt barred by the statute of limitations.
B) An illusory promise.
C) A promise to supply all of the materials a manufacturer will need for the production of a certain item for a specified period of time.
D) In the majority of states, a promise by a father to pay someone who rendered emergency services to his injured son before the father had arrived at the accident scene.