Given that: Gadget has-a Sprocket and Gadget has-a Spring and Gadget is-a Widget and Widget has-a Sprocket Which two code fragments represent these relationships? （）

A.Compilation fails because of an error in line 7.
B.Compilation fails because of an error in line 9.
C.If you define D e = new E(), then e.bMethod() invokes the version of bMethod() defined in Line 5.
D.If you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 5.
E.If you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 9.

A.r，t，t，
B.r，e，o，
C.Compilation fails.
D.An exception is thrown at runtime.

A.Line 5
B.Line 6
C.Line 7
D.Line 8
E.Line 9
F.Line 10