以下程序的运行结果是: 
#include
void main( )
{
  char str[][20]={"china","hubei","wuhan"};
  int i ;
  for(i=0;i<3;i++)
  {
    printf("%s-", str[i]+i);
  }
}
A、china-ubei-han-
B、china-hubei-wuhan-
C、hina-bei-an-
D、ina-ubei-wuhan-