设有如下说明　　typedef struct　　{　int n; char c; double x;}STD;　　则以下选项中 ，能正确定义结构体数组并赋初值的语句是

A． STD tt[2]={{1,''A'',62},{2,''B'',75}};

B． STD tt[2]={1,"A",62,2,"",75};

C． struct tt[2]={{1,''A''},{2,''B''}};

D． struct tt[2]={{1,"A",62.5},{2,"B",75.0}};