现有下列程序语句，执行后的结果是()#include＜stdio．h＞void main(){char s1[100]="123"，s2[100]="qwer"；puts(s1)；puts(s2)；printf("%s%s"，s1，s2)；}
A．123 qwer123 qwer
B．123qwer123qwer
C．123qwerl23qwer
D．123qwer123qwer