跑道中线灯最后300米的颜色是哪一种？What is the colour of the last 300m of runway

跑道中线灯最后300米的颜色是哪一种？What is the colour of the last 300m of runway center light？

A.红色。red

B.绿色。green

C.白色。white

正确答案是1