Why Shouldn't an Abstract Method Be Declared Final

Multiple Choice

Why shouldn't an abstract method be declared final?

A) There's nothing wrong with doing so
B) Abstract methods cannot be overriddenand they must be if a concrete class ever is to be instantiated
C) So long as the Abstract method never actually is used in by any other method, there's no problem with doing this
D) So long as the Abstract method is declared in a Class (not an Interface) , there's nothing wrong with doing this
E) None of the above