On 1 January 2013, Dam, who lives in Rayong, made a written offer to sell a car to Dang, who lives in Chiang Rai, and mentioned that Dang had to send the acceptance within 10 January 2013. upon receipt of the offer, Dang immediately sent the acceptance letter to buy the car. But due to the storm, it caused the delay to the transportation. The letter then arrived to Dam’s house on 12 January 2013. in this case, if Dam wanted to withdraw the offer, he could do in 2 occasions: