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【单选题】
如图：抛物线y=ax 2 +bx+c（a≠0）的图象与x轴的一个交点是（-2，0），顶点是（1，3）．下列说法中不正确的是（ ）A.
抛物线的对称轴是x=1
B.
抛物线的开口
C.
抛物线与x轴的另一个交点是（2，0）
D.
当x=1时，y有最大值是3
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