A simple nervous system A) must include chemical senses, ...

[geoffrey]

A simple nervous system
A) must include chemical senses, mechanoreception, and vision.
B) includes a minimum of 12 effector neurons.
C) has information flow in only one direction: toward an integrating center.
D) has information flow in only one direction: away from an integrating center.
E) includes sensory information, an integrating center, and effectors.

[j_sun]

I recall doing this last year, it's E, bye bye!