Stats LLC$,$ a vintage car dealer, advertises the sale of a $1964$ Ford Thunderbolt. Rick responds to the advertisement with an offer of $$80,000$ for the car. Stats signs a written assurance to keep that offer open to Rick for a fortnight. Five days before the fortnight is up$,$ Stats sells the car to another buyer. At the end of the fortnight period, Rick tenders $$80,000$ for the car, but the car has already been sold. Rick then buys the same model car from another dealer for $$90,000$ and sues Stats for breach of contract. The court rules that Stats is liable to Rick for breach of contract and orders Stats to pay Rick the difference of $$10,000$ he paid extra to the second dealer for the car. Which of the following rules governs the execution of this contract?

Question $1$Select

Gap$-$filling rule.