One afternoon, Xiaohong first participated in the women's 100m competition at the school sports meeting, and then participated in the women's 400m competition after a while. The picture is taken by th

One afternoon, Xiaohong first participated in the women's 100m competition at the school sports meeting, and then participated in the women's 400m competition after a while. The picture is taken by the photographer at the same location.

According to the law of parallel projection: from morning to evening, the direction of the object is: west-northwest-north-northeast-east, and the shadow length changes from long to short, and then to longer; then photo B is 100m long. , Photo A is of someone participating in the 400m.

So choose A.