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.