以下哪组R命令会生成如下图形?
A.x=1:10 y=c(2,7,3,5,9,8,7,6,1,7) plot(x,y) grid(nx=4,ny=4,col="red")
B.x=1:10 y=c(2,7,3,5,9,8,7,6,1,7) plot(x,y) lines(nx=4,ny=4,col="red")
C.x=1:10 y=c(2,7,3,5,9,8,7,6,1,7) plot(x,y) grid(nx=4,ny=4,col="green")
D.x=1:10 y=c(2,7,3,5,3,8,7,6,1,7) plot(x,y) grid(nx=4,ny=4,col="red")