On a Dark Night,why Do You See a Faint Star

Multiple Choice

On a dark night,why do you see a faint star better if you focus slightly to the side of it?​

A) Perception of faint light is better outside the fovea.
B) ​The pupil casts a shadow onto the fovea.
C) ​Cones are more abundant slightly outside the fovea than within it.
D) ​Perception of detail is better outside the fovea.