单项选择题

A.int m[][3]={{1,2,3},{4,5,6},{7}};
B.int m[][3]={{1,2},{3,4},{5,6,7}};
C.int m[][3]={{1,2,3},{4,5},{6,7}};
D.int m[][3]={{1},{2,3,4},{5,6,7}};