单项选择题

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}};