Analysis of Blank (i)
The first blank describes the result of the eye-brain system: our ability to interact with and understand the visual world.
- A. apprehension of: This means the understanding or grasping of something. It is the best term to describe our total ability to perceive and interpret the visual world. (Correct)
- B. habituation of: Becoming accustomed to something. (Too narrow.)
- C. repudiation: Rejection. (Incorrect.)

Analysis of Blank (ii)
The sentence states that our visual understanding is only possible through the finely tuned (ii)
________ of eye and brain. The eye gathers light, and the brain processes it; they must work together.
- D. collaboration: The action of working together. This accurately describes the essential partnership between the eye (retina) and the brain (occipital lobe). (Correct)
- E. perception: This is what the system achieves, not the relationship between the parts.
- F. differentiation: Distinguishing between things. (Too narrow.)

Analysis of Blank (iii)
The final blank describes the necessary function of the occipital lobe. Without the lobe to (iii)
________ the "cacophony" (a harsh, discordant mixture) of input, there would be no "coherent picture".

The lobe must take the noise and turn it into order. Therefore, it must organize and control the chaotic data.
- G. suppress: To eliminate. (Incorrect; eliminating the data means no picture.)
- H. reform: To change/improve. (Wrong context.)
- I. manage: To control or administer; to deal with or direct. This perfectly describes the function of the brain in processing disorganized sensory input into a usable, coherent picture. (Correct)

Final Solution

The completed sentence is:
Our apprehension of (i) the visual world-from the most startling colors to the tiniest distinction between two shades of grey-is only possible through the finely tuned collaboration (ii) of eye and brain. For without light striking the retina, there would be no image for the occipital lobe to project, in a manner of speaking, onto the part of mind responsible for our visual awareness. And without the occipital lobe to manage (iii) the cacophony of visual input being relayed from the eyes, there would be no coherent picture of reality to perceive.

Blank (i): A. apprehension of
Blank (ii): D. collaboration
Blank (iii): I. manage