A. Choroid is the middle layer of eye which is bluish in colour and contains many blood vessels. It prevents internal reflection of light in the eye.
B. Cornea is anterior portion of sclera which absorbs oxygen from air.
C. Sclera is the external layer of eye which maintains the shape of eye and also protects it.
D. Conjunctive is thin and transparent membrane lining the eyelids.
E. Ciliary body is a part of eye that consist of ciliary muscles and control the shape of lens.
So, the correct answer is 'Choroid'.