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 2 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}