The correct answer is option 4: Compound eyes. Compound eyes are made up of many small lenses called ommatidia. Each ommatidium captures a small portion of the visual field, and the brain of the ant processes the signals from all the ommatidia to create a composite image. This allows the ant to have a wide field of view and detect movement in multiple directions. Compound eyes are well-suited for detecting motion and changes in the environment, which is important for an ant to navigate its surroundings and locate food or other ants. Simple eyes (option 1) are not capable of providing a wide field of view, and eyes over the head (option 2) is not a recognized type of eye. While option 3 mentions well-developed eyes, it is not specific enough to accurately describe the type of eyes ants possess.