Answer: B. unconsciousness and inability to remember what happened.
Rohypnol, also known as roofie or the date-rape drug is a type of depressant that brings about unconsciousness and an inability to remember what happened, so option B is the correct answer.
It takes about 30 minutes to take effect, and the effects can last for up to 8 hours, depending on the amount. It makes one drowsy and easier to manipulate since it affects psychometric abilities and makes it harder to speak properly or control the body.