单项选择题

1. class MyThread implements Runnable { 
2. public void run() { 
3. System.out.print("go "); 
4. } 
5. 
6. public static void main(String [] args) { 
7. // insert code here 
8. t.start();
9. } 
10. } 
和如下四句: 
Thread t = new MyThread();
MyThread t = new MyThread(); 
Thread t = new Thread(new Thread()); 
Thread t = new Thread(new MyThread()); 
分别插入到第5行,有几个可以通过编译?() 

A.0
B.1
C.2
D.3