Jimmy wants to buy Fred's motorcycle for $$500,$ but Fred isn't interested. After Jimmy threatens to egg Fred's house, Fred relents and sells him the motorcycle for $$500$ to prevent the egging. Is this an enforceable contract?

Yes, because there was an offer, acceptance, and consideration exchanged.

No$,$ because Fred accepted under duress.

Yes, because $$500$ was a really good deal for Fred's beat up motorcycle.

No$,$ because the contract was not in writing.