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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

A.private synchronized Object o；
B.void go（） {synchronized（） { /* code here */ }
C.public synchronized void go（） { /* code here */ }
D.private synchronized（this） void go（） { /* code here */ }
E.void go（） {synchronized（Object.class） { /* code here */ }
F.void go（） {Object o = new Object（）；synchronized（o） { /* code here */ }