B

Step 1: Understand the function of the retina. The retina is the light-sensitive layer at the back of the eye that captures light images and converts them into neural signals.
Step 2: Compare with camera components: In a camera, the film (or image sensor in digital cameras) captures the light and forms the image, similar to how the retina adjusts to light and captures visual information.
Thus, the retina acts like the film of a camera.
Therefore, the correct answer is B.