George offers to sell his car to Suzy for $10,000 on the coming Sunday, to which Suzy agrees. They write down the details on a paper. On the decided day, Suzy pays the cash to George, but he refuses to sell the car to her saying that his friend Marty has offered to pay $30,000 for the same car. On the basis of which doctrine can Suzy sue George?

Quasi-contract

Partially executed contract

Executory contract

Promissory estoppel

Implied contract

Promissory estoppel

Promissory estoppel states that a person who has promised to fulfill a contract cannot go back on the promise even if consideration was yet to be given. The affected party can file suit against the party who refused to fulfill his promise and can claim damages.

If George has now made a pledge to a Susy who then relies on that pledge for a subsequent disadvantage, what Promissory estoppel is supposed to do is prohibit the promisor George from demanding that an underlying pledge should not be legally allowed or enforced. So Susy will sue George on a promissory estoppel basis and get a reward for the disappointment of George