Kenneth owns the original scripts to all of the Biack Mirror episodes, each of them signed by the writers and actors. He mails a lefter to a prospective buyer on January $15.$ offering to sell the scripts for $$25,000.$ The letter was delivered to Buver on January $17.$ Buyer mailed a letter to Kenneth on lanuary $19,$ stating that she accepted the offer.

Buyer's letter of January $19$ operates as an acceptance even under which of the following circumstances?

Buver's letter is lost by the post office.

Buver knew that Kenneth sold the property to a third party on January $18.$

Buyer misaddressed the envelope and, as a result, it was not delivered to Kenneth until February $1,$ after Kenneth had sold the property to a third party.

Kenneth telephones Buyer on January $18$ telling. Buyer that he revokes the offer.