Ed Writes Gwen a Letter and Offers Her a Job

Ed writes Gwen a letter and offers her a job as a financial analyst for his construction company at a salary of $75,000.00 a year. Two days later he sends her another letter telling her that he has changed his mind. Gwen receives both of the letters and after reading the letter with the job offer, does not open the second letter, and spends a couple of days thinking about the offer and whether she should accept it. Four days later, Gwen decides to accept the offer but still has not read the second letter revoking the offer. Which statement is correct?

A) As long as Gwen has not opened the revocation letter, she has no actual notice of the revocation and may accept the original offer.
B) A revocation is only effective once the offeree has actual notice of it.
C) A revocation is effective once it is received and no actual notice is needed.
D) The revocation is not effective when mailed. It must be in person.