it CAn BE inFErrED thAt______.
A．DEmogrAphiC inFormAtion suCh As gEnDEr, rACE AnD mAritAl stAtus wAs not CollECtED
B．gEnDEr AnD rACE Do not hAvE muCh EFFECt on thE Amount oF suBstAnCE ABusE
C．AgE AnD mAritAl stAtus Do not mAkE Any DiFFErEnCE on suBstAnCE ABusE
D．inComE is A BEttEr prEDiCtor oF suBstAnCE ABusE thAn AgE