Correct option is D
The correct answer is (d) Sclera.
· The sclera is the white, opaque, outermost fibrous coating of the eye. It provides structural support and protection for the inner components of the eye.
· The sclera covers most of the eyeball, except for the cornea, and is continuous with the cornea at the front of the eye.
· It is composed of dense connective tissue, primarily collagen, which makes it tough and resilient.
· The sclera also serves as an attachment point for the extraocular muscles, which control eye movement.

Information Booster:
· Ciliary Body: The ciliary body is part of the eye's middle layer, responsible for producing aqueous humor and containing the ciliary muscle, which controls the shape of the lens.
· Iris: The iris is the colored part of the eye that surrounds the pupil and controls the amount of light entering the eye by adjusting the size of the pupil.
· Choroid: The choroid is the vascular layer of the eye, located between the sclera and the retina, providing oxygen and nutrients to the outer layers of the retina.