Read the following passage and mark the tetter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 26 to 30.

In the black and white photo, the panther is hardly visible, but as soon as we add colour, it's easy to (26)______ the predator from the background. Why? Because in the black and white picture you are only seeing the surfaces according to how much light they reflect. The colour lets you see the quality of light as well as the quantity and reveals the panther. In a real-life jungle situation, this might save your life, and the importance of colour (27)________ might therefore explain why people are generally more fearful in the dark.
The sense of sight, however, is about (28)_______ more than what our eyes actually see. (29)_______what we see is pretty meaningless - it's just patterns of light. We need the brain to interpret these patterns, and it tends to do this in ways (30)________ have proved useful in the past. This is usually helpful, but sometimes this means the brain actually creates an illusion by trying to make sense of information from the eyes.