__________ prevention refers to the very broad range of activities aimed at reducing the risk of drug use among non-users and assuring continued non-use, whereas ___________ prevention is equivalent to drug abuse treatment, and ___________ prevention is targeted at at-risk groups, experimenters and early abuse populations in hopes of reversing the already existing drug use.A. Primary; secondary; tertiaryB. Secondary; tertiary; primaryC. Tertiary; secondary; primaryD. Primary; tertiary; secondary