Whose Experience Has Been Identified by Scientists as Directly Contributing

Whose experience has been identified by scientists as directly contributing to some cases of ADHD?

A) Pam, who is consuming a beverage that is full of sugar.
B) Jim, who is eating a muffin that is laced with red food coloring.
C) Angela, who has always liked watching and playing videogames.
D) Dwight, who suffered from a lack of oxygen during his birth