Dunne and Cook signed a contract requiring Cook to rebind 500 of Dunne's books at 80 per book. Later, Dunne requested, in good faith, that the price be reduced to 70 per book. Cook agreed orally to reduce the price to 70. Under the circumstances, the oral agreement is Unenforceable because Dunne failed to give consideration, but proof of it is otherwise admissible into evidence. Enforceable, but proof of it is inadmissible into evidence. Enforceable, and proof of it is admissible into evidence. Unenforceable due to the statute of frauds, and proof of it is inadmissible into evidence