A) people your age because (I'll try my best to explain) it's people YOUR age so you might feel like you need to do it because they're doing it, because well.. they're your age.
Answer:
Radon
Explanation:
I'm not entirely sure, but from my studies:
Radon gas is a type of substance that can cause lung cancer. It is colorless and odorless. It mostly spreads outdoors rapidly.
Hope this helped! I am trying very hard to learn English, so if you can't understand than I am sorry.
Answer:
I think that is A) prepared under Kosher rules
Explanation:
If you were to stand on your head all the blood would flow to your brain