These all sound like they will have me fired and arrested.

Since weed isn't something for me I would probably choose 3 without me participating. I think this is the most legal way in Germany anyway. :D

I wouldn't take it from them. I'd say WOW GUESS YOU HAVE THAT FOR MEDICAL PURPOSES, HUH? PROBABLY HAVE THE CARD ON YA, HUH? YEH YOU DO, NO NEED TO SHOW IT TO ME. OKAY SO THIS IS ALL LEGAL. BE CAREFUL AND GOODBYE, YOUTHS.

I'd never seize it in the first place, I'd just be like 'hey kid, be careful, around here the wrong person catches you with this shit and it's game over' and just give it back to him

Idk

neither. I would lock it up in an underground safe, beneath a mountain, protected by a dragon. then pass a rumor that there's an ancient civilization somewhere on this planet that used some powerful elixir for eternal life on the planet, and there is a small amount of said elixir left. and then watch the chaos slowly unfold.

3, sharing is caring and an important value to learn early on.

Give it to the police.

Smoke it.