The Most Striking Similarity Between the Effects on Children of Watching

The most striking similarity between the effects on children of watching television and the effects on children of playing video games is that

A) ​they both rob a child of his/her ability to pay attention, and over the long term they both invariably lead to significant deficits in this area.
B) ​whether the activity is done alone or with others ultimately determines the outcomes of these activities.
C) ​the number of hours watching or playing is what determines the ultimate outcome of these activities.
D) ​the content of what is watched or played is what determines the ultimate outcome of these activities.