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C语言程序设计单选题中等

以下哪项可以正确初始化一个二维数组?

Aint a[2][3] = {1,2,3,4,5,6};
Bint a[2][3] = {{1,2,3},{4,5,6}};
Cint a[2][3] = {1,2,3,4,5};
Dint a[2][3] = {1,2};