According to the given sentence, the correct option is A: The reticular formation is a network of nerves located in the brain-stem.
The reticular formation is defined as a structure of the brain stem that is responsible for circadian sleep / wake cycles.
The reticular formation helps to serves the behavioral and cognitive mood related functions.
The main function of this formation is to operate the sleep and wake functions accurately of a particular person.
Therefore, correct option is A.
Learn more about Reticular formation, refer to the link:
https://brainly.com/question/1228183
