The Hypothesis That Attention Deficit/hyperactivity Disorder (ADHD)may Be Influenced by Toxins,food

The hypothesis that attention deficit/hyperactivity disorder (ADHD) may be influenced by toxins,food additives,or diet

A) is based on well-controlled studies.
B) is not well understood or studied, but generally effective as a treatment.
C) appears true for a small subset of individuals diagnosed with ADHD.
D) has no scientific evidence.