Im going to say A. To me, it seems a lot like the negative effects of the overconsumption of alcohol.
Answer:
Independent: electronics in room
Dependent: hours of sleep
Control: school nights, night routine, lighting of room, the time the person decides to go to bed
Confounding: the person(?? not entirely sure on this one)
Answer:
It cures all cases of cystic fibrosis.
Explanation:
