The correct answer is B. Sclera.
The sclera is the white, opaque outer layer of the eye. It is the tough, fibrous, protective covering that gives the eye its shape and helps to keep its contents in place. The sclera is continuous with the cornea, the clear, dome-shaped front part of the eye. The sclera is also continuous with the conjunctiva, the thin, transparent membrane that lines the inside of the eyelids and covers the white part of the eye.
The sclera is made up of collagen fibers, which are strong, flexible proteins that give the sclera its strength. The sclera is also covered by a thin layer of cells called the epithelium. The epithelium helps to protect the sclera from damage and infection.
The sclera is a very important part of the eye. It helps to protect the eye from injury and infection. It also helps to keep the eye in shape and to keep its contents in place.
The other options are incorrect.
- The cornea is the clear, dome-shaped front part of the eye. It helps to focus light onto the retina.
- The iris is the colored part of the eye. It controls the amount of light that enters the eye.
- The retina is the light-sensitive tissue at the back of the eye. It converts light into electrical signals that are sent to the brain.