问答：What shape is it? — 英语选择题
题目
Sam 描述他画的图形：It has 4 sides (4条边) and 4 corners (4个角). All the sides are the same length (每条边一样长). It is not a rectangle (长方形). Lucy asks: What shape is it? Sam should answer: ___.
A. It's a triangle.
B. It's a square.
C. It's a circle.
D. It's a rectangle.