【单选题】

"Substance abuse" (Line 5, Paragraph 1) is preferable to "drug abuse" in that ______.
A．substances can alter our bodily or mental functioning if illegally used

B．"drug abuse" is only related to a limited number of drug takers
C．alcohol and tobacco are as fatal as heroin and cocaine
D．many substances other than heroin or cocaine can also be poisonous