Which of the following is one of the chief problems confronting the train companies？A．They

Which of the following is one of the chief problems confronting the train companies？

A．They are blamed by the public for overcharging.

B．They have no freedom of pricing.

C．They lack funds to upgrade main-line services.

D．They have not sufficiently used rural lines.

请帮忙给出正确答案和分析，谢谢！