单选题
下列图形最有可能是哪段代码执行后的结果？（ ）
A.
import turtle
turtle.forward(100)
turtle.left(90)
turtle.circle(50,180)
turtle.down()
B.
import turtle
turtle.forward(100)
turtle.left(90)
turtle.circle(50,-180)
turtle.down()
C.
import turtle
turtle.forward(100)
turtle.left(90)
turtle.circle(50,90)
turtle.down()
D.
import turtle
turtle.forward(100)
turtle.left(90)
turtle.circle(50,-90)
turtle.down()
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