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A.The code will compile without changes.
B.The code will compile if public Tree（）{Plant（）；} is added to the Tree class.
C.The code will compile if public Plant（）{Tree（）；} is added to the Plant class.
D.The code will compile if public Plant（）{this（"fern"）；} is added to the Plant class.
E.The code will compile if public Plant（）{Plant（"fern"）；} is added to the Plant class.

A.Line 26 prints "a" to System.out.
B.Line 26 prints "b" to System.out.
C.An exception is thrown at runtime.
D.Compilation of class A will fail due to an error in line 6.