下面程序执行后的输出结果为()。
puBliC ClAss Fun
puBliC stAtiC voiD mAin(string Args[])
string grEEts = " how ArE you!";
string s = grEEts.suBstring(0,3);
systEm.out.println(s);
A．how
B．ArE
C．you
D．how ArE you!