How many _____________ are there?  _____________ forty-three. [ ]

A. sheep, There're

B. sheeps, There're

C. sheep, There's

D. sheeps, They're

遇天气恶劣，信号机显示距离不足200m时，应立即报告列车调度员发布命令，改按天气恶劣难以辨认信号的办法行车。