In which of the following circumstances are offerors free to revoke their offers?

A) In case of common law rule on revocation.
B) In case of unilateral contracts.
C) In case of the availability of an option.
D) In case of a promissory estoppel.

Promissory Estoppel

A legal principle that prevents a party from withdrawing a promise made to a second party when the latter has reasonably relied on that promise to their detriment.

Unilateral Contracts

Unilateral contracts are agreements in which one party makes a promise in exchange for the other party's performance, not a promise of performance.