Experts Have Long Suspected That Attention-Deficit/hyperactivity Disorder Has a Biological

question 334

Multiple Choice

Experts have long suspected that attention-deficit/hyperactivity disorder has a biological basis, but EEG studies of electrical brain activity and imaging studies of brain structures and neurotransmitters have ________ differences between people with ADHD and control groups.

• A)failed to reveal consistent
• B)found large and consistent
• C)found small but consistent
• D)found large but inconsistent