Which of the following sentences is wrong?

A、Retina is the inner layer of eye ball;

B、Retina is thin, delicate, sensory tissue composed of layers of light-sensitive nerve cells;

C、Rods function chiefly in dim light. Cones function best in bright light;

D、Retina begins at the iris and encircles the entire interior portion of the eye;

E、none of the above