5151Which of the following is an advantage the private postal services had over the governmen2785

Which of the following is an advantage the private postal services had over the government postal system？ 查看材料 A.Delivering mail more cheaply. B.Delivering mail faster. C.Delivering mail to rural areas. D.Delivering more mails. 请帮忙给出正确答案和分析，谢谢！