Depressants and stimulants are categories of prescription drugs which are highly regulated because they have a strong potential for abuse and addiction. a-opioids    b-antibiotics  c-benzod-adderall

The correct answer is:  [A]:  "opioids" .

Note:  Let us consider the other answer choices given.

Choice:  [B]:  "antibiotics" are prescription drugs; but are not AS highly regulated since they do not have a STRONG potential for "abuse and addiction". 

Choice:  [C]:  "benzo" ; is incorrect.  Note:  "Benzos" is a slang term, or "vernacular" term, for the "benzodiazepines".  If the answer choice was, in fact, "benzodiazepines", then the answer could be correct. 
  But also note that "benzodiazepines" are, in fact, "central nervous depressants"; as such, the sentence: "Benzos, depressants, and stimulants..."; would not make sense.

Choice  [D}:  "Adderall", is a brand name of drug that could make sense.
     But note that "Adderall" is a stimulant drug; so:
"Adderall, depressants, and stimulants..." ;  would not make sense.

As such:  The correct answwer is:  Answer choice:  [A]:  "opioids" .

Its either c or d. i would go with d though, because im not sure if its legal in all of the us