Asimple nervous system has information flow in only one direction:

a) toward an integrating center.
b) has information flow in only one direction: away from an integrating center.
c) includes sensory information, an integrating center, and effectors.
d) must include chemical senses and vision.
e) includes sensory information but no effectors.

The correct option is a) toward an integrating center.

Explanation:

A simple nervous system has information flow in only one direction: toward an integrating center. The integrating center is a part of our central nervous system (formed by the brain and spinal cord) that is responsible for receiving stimulations from the afferent pathway, that is, it's where the afferent or sensory information is centralized and the adequate response is elaborated, so through one or multiple synapses communicate it with the efferent pathway, through this pathway composed of nerve fibers, the information travels to the effect organ, which is responsible for manifesting the final response.

2%? i tried finding the exact sorry if it's not 100% correct ; -;