【单项选择题】
What statement is true？（）<br /> <img src="https://img.ppkao.com/2018-08/zhoulian/2018080111230699141.jpg" /><p> What statement is true？（）<br /> <img src="https://img.ppkao.com/2018-08/zhoulian/2018080111230699141.jpg" /></p>
A、A.The code will compile without changes.
B、B.The code will compile if public Tree（）{Plant（）；} is added to the Tree class.
C、C.The code will compile if public Plant（）{Tree（）；} is added to the Plant class.
D、D.The code will compile if public Plant（）{this（"fern"）；} is added to the Plant class.
E、E.The code will compile if public Plant（）{Plant（"fern"）；} is added to the Plant class.
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