public class X implements Runnable （  private int x；  private int y；  public static void main（String [] args） （  X that = new X（）；  （new Thread（that）） . start（ ）；  （new Thread（that）） . start（ ）；  ）  public synchronized void run（ ） （  for （；；） （   x++；  y++；  System.out.printIn（“x = “ +  x  + “， y = “ + y）；  ）  ）  ）   What is the result？（）  

• A、 An error at line 11 causes compilation to fail.
• B、 Errors at lines 7 and 8 cause compilation to fail.
• C、 The program prints pairs of values for x and y that might not always be the same on the same line （for example， “x=2， y=1”）
• D、 The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by “x=1， y=1”）
• E、 The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by “x=2s， y=2”）