The company A will issue a price to the company B and sell a batch of silk fabrics. If you accept it, please reply before the end of May. On May 10th, the company B stated that your asking price is too high. Please lower the price. Half a month later, the market conditions changed. On May 25, the company B stated that your offer has been accepted. The company A ignored it and sold the goods to the company C. So does Company A default? why?