A.4321
B.0000
C.An exception is thrown at runtime.
D.Compilation fails because of an error in line 18.

A.double getSalesAmount() { return 1230.45; }
B.public double getSalesAmount() { return 1230.45; }
C.private double getSalesAmount() { return 1230.45; }
D.protected double getSalesAmount() { return 1230.45; }