The correct answer is A. Serotonin and norepinephrine
Step-by-step explanation:
The obsessive-compulsive disorder is a mental disorder characterized by the individual experiencing constant compulsive behaviors such as repeating an action multiple times, as well as behaviors that represent obsessions such as obsessive thoughts about some situation.
In terms of cause, it has been found this mental disorder is related to genetics, but also to a deficiency in the neurotransmitters serotonin and norepinephrine considering serotonin has a connection with mood and feeling happy; while norepinephrine is related to alertness, attention, and anxiety which are all aspects that represent an issue in Obsessive-compulsive disorder. Indeed, one of the most effective treatments for this mental disorder is a combination of serotonin and norepinephrine reuptake inhibitors that regulate and increase the amount of serotonin and norepinephrine in the individual.