A nurse notes that a client's eyes are reddened, and the client states that an eye infection has been diagnosed.. Conjunctiva

A nurse notes that a client's eyes are reddened, and the client states that an eye infection has been diagnosed. The nurse understands that the client most likely is referring to infection of which of the following structures, which provides a protective covering for the eye?
a) Iris
b) Lens
c) Cornea
d) Conjunctiva***