The birds move their neck very often because

Options

A. the birds eyes are fixed.
B. the birds have small eyes.
C. their ears are covered with feathers.
D. they can fly.

Answer

A

Explanation

Birds move their necks a lot. The reason for this is that the pupil of the eyes of birds cannot rotate
That's why they keep moving their neck to look from side to side.
So option A is correct.