单项选择题

A.ARIMA(0,1,0)Yt=Yt-1
B.ARIMA(0,1,0)Yt=Yt-1+Et
C.ARIMA(0,1,0)Yt=U+Yt-1+Et
D.ARIMA(0,1,0)Yt=U+Yt-1