Here's a question: John can't find any legal alternatives to what he's looking for.  It's very illegal, exacerbated by the fact that he's too young to travel out of the country to get it.  Where will he have to get it from?

Here are possible answers to this question:
- rules
- white market
- banned
- underage
- black market

I believe the correct choice is "black market", here's why:


black market definition & example | investinganswers