On september 10, harris, inc., a new car dealer, placed a newspaper advertisement stating that harris would sell 10 cars at its showroom for a special discount only on september 12, 13, and 14. on september 12, king called harris and expressed an interest in buying one of the advertised cars. king was told that five of the cars had been sold and to come to the showroom as soon as possible. on september 13, harris made a televised announcement that the sale would end at 10: 00 pm that night. king went to harris' showroom on september 14 and demanded the right to buy a car at the special discount. harris had sold the ten cars and refused king's demand. king sued harris for breach of contract. harris' best defense to king's suit would be that harris'
a. offer was un-enforceable.
b. advertisement was not an offer.
c. television announcement revoked the offer.
d. offer had not been accepted.