public class TestFive {  private int x；  public void foo（） {  int current = x；  x = current + 1；  }  public void go（） {  for（int i=0；i<5；i++） {  new Thread（） {  public void run（） {  foo（）；  System.out.print（x + “， “）；  } }.start（）；  }}}  Which two changes， taken together， would guarantee the output： 1， 2， 3， 4， 5， ？（）

• A、 Move the line 12 print statement into the foo（） method.
• B、 Change line 7 to public synchronized void go（） {.
• C、 Change the variable declaration on line 3 to private volatile int x；.
• D、 Wrap the code inside the foo（） method with a synchronized（ this ） block.
• E、 Wrap the for loop code inside the go（） method with a synchronized block synchronized（this） { // for loop code here }.