The Parent of a Child Diagnosed with Attention-Deficit/hyperactivity Disorder (ADHD)

The parent of a child diagnosed with attention-deficit/hyperactivity disorder (ADHD) tells the primary care pediatric nurse practitioner that the child gets overwhelmed by homework assignments, doesn't seem to know which ones to do first, and then doesn't do any assignments. The nurse practitioner tells the parent that this represents impairment in which executive function?

A) Activation
B) Effort
C) Emotion
D) Focus