Assume that the expected dividend growth rate (g) for a firm decreased from 5% to zero. Further, assume that the firm's cost of equity (k) and dividend payout ratio will maintain their historic levels. The firm's P/E ratio will most likely:（）

A. become undefined.

B. increase.

C. decrease.

自动闭塞区段，机车信号显示一个半黄半红色闪光灯光，表示列车接近的进站或接车进路信号机开放（）信号或通过信号机显示容许信号。