public class Foo implements Runnable （  public void run （Thread t） {   system.out.printIn（“Running.”）；   }   public static void main （String args） {   new thread （new Foo（））.start（）；   }   ）   What is the result？（）  

1. A  An exception is thrown.
2. B  The program exists without printing anything.
3. C  An error at line 1 causes compilation to fail. 正确答案
4. D  An error at line 6 causes the compilation to fail.
5. E  “Running” is printed and the program exits.