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The zunular fibers that support the lens are attached to the

  1. iris

  2. medial rectus

  3. stroma

  4. ciliary body

The correct answer is: ciliary body

The correct answer is D because the ciliary body is a structure in the eye that contains the ciliary muscle and the ciliary processes, both of which are responsible for regulating the shape of the lens and its ability to focus on objects at different distances. The iris (option A) is a pigmented muscle that controls the size of the pupil, but it is not directly involved in supporting the lens. The medial rectus (option B) is one of the six muscles that control eye movement, but it is not associated with the lens or its support. The stroma (option C) is the middle layer of the cornea, but it is not connected to the lens or its supportive fibers. Therefore, option D is the most correct answer as it refers to the ciliary body, which directly supports the lens through its attached fibers.