下面程序段的输出结果是 class Test public static void main(String args[]) MyThread t=new MyThread()； t．displayOutput( t has been createD) )； t．start()； class MyThread extends Thread public void displayOutput(String s) System．out．println(s)； public void run() displayOutput( t is running． )；
A．t has been created．
B．t has been created．
t is running．
C．t is running．
D．编译出错