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

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

Correct Answer:

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