Christiansen Motors ran an ad in the Saturday newspaper with the following language, "The first 10 customers who come to the dealership and purchase a car will get 0% financing for 4 years on any car." Greta Jones went to Christiansen’s show room to buy a car with 0% financing, but Christiansen refused to sell a car at 0% financing because it had already sold 10 cars before Greta arrived. Which of the following is correct?​ a. ​Christiansen made an offer with its newspaper ad. b. ​Christiansen needed to be more careful in its language and put a time limit on the offer or sell a car to Greta for the promised rate. c. ​Christiansen did not make an offer and was not obligated to sell the first 10 cars. d. ​Christiansen must sell a car to Greta at 0% financing because it ran an ad promising to do so. e. ​Christiansen need not sell a car to Greta for the rate in the ad.