Final answer:
The neurotransmitter associated with aggression, extraversion, and attention seeking when at low levels is serotonin, making option b) Serotonin the correct answer.
Step-by-step explanation:
Low levels of the neurotransmitter known as serotonin are associated with aggression, extraversion, and attention seeking. Therefore, the correct answer to the question is b) Serotonin. Serotonin plays a crucial role in mood regulation, and low levels have been linked with a range of behavioral and emotional issues. It differs from other neurotransmitters mentioned, such as dopamine, which is involved in reward and motivation; GABA, which is primarily inhibitory and associated with relaxation and anxiety reduction; and acetylcholine, which is integral to muscle function and memory. An understanding of neurotransmitters and their effects is vital in the study of neuropsychology and the treatment of various mental health disorders.