【单项选择题】
Which statement is true？（）<br /> <img src="https://img.ppkao.com/2018-08/zhoulian/201808011653256522.jpg" /><p> Which statement is true？（）<br /> <img src="https://img.ppkao.com/2018-08/zhoulian/201808011653256522.jpg" /></p>
A、A.Compilation fails.
B、B.An exception is thrown at runtime.
C、C.Synchronizing the run（） method would make the class thread-safe.
D、D.The data in variable "x" are protected from concurrent access problems.
E、E.Declaring the doThings（） method as static would make the class thread-safe.
F、F.Wrapping the statements within doThings（） in a synchronized（new Object（））{} block would make the class thread-safe.
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