BIOLOGY > HUMAN BIOLOGY > HORMONE
EXPLANATION:
>Serotonin = It is one of the hormones known as "happy hormones". It is important for mood regulation, memory and cognition processes, and sleep.
>Epinephrine = It is more known as adrenaline and is a hormone that is released during strong emotions like fear or anger.
>Dopamine = It is one of the hormones known as "happy hormones". It is important for movement, coordination, and compulsion.
>Acetylcholine = It is important for muscle contraction.
ANSWER: A