Answer:
The correct answer is option A. dopamine.
Explanation:
ADHD or the attention deficit hyperactivity disorder is a neurodevelopment disorder in which individuals experience hyperactivity and not able to maintain attention that affects the life of the individual.
ADHD has a connection with the dopamine neurotransmitter level in the brain and neurons. It said that the low dopamine level makes are associated with the symptoms of ADHD.
Thus, the correct answer is option A. dopamine.