Sometimes my eyes are puffy but most of the time i have the dark circles under my eyes without the puffy eyes. why do i have dark circles under my eyes without puffy eyes most of the time, and is this normal?

If you go to bed late all of that is normal
But if not ask a parent , guardian or someone you trust because you might want to consider a doctor.

ONLY IF YOU GO TO BED REALLY LATE IS IT NORMAL
 
- Have a great day 

Unless you usually go to bed late every day or every other day , than I would consider it okay. Though if you don't and it just occurs puffy like you described than you might want to consider seeing a doctor or specialist.
Hope I helped :)
And Hope you feel better :)

The answer would be d. most contraceptives are effective when used properly