What Do Desjardins and Duska Say About the Harm Argument

What do Desjardins and Duska say about the Harm Argument?

A) There is very little evidence that drug use causes harm.
B) The harm argument could justify drug use in occupations in which the potential for harm is clear and present.
C) The possibility of harm does not warrant the actual invasion of privacy that results from mandatory drug testing.
D) All o the above