Sensory systems develop on a "staggered" schedule. Taking vision and audition as examples, a staggered schedule would mean that:

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Sensory systems develop on a staggered schedule, which means that different systems mature at different rates. In the case of vision and audition, research has shown that audition tends to mature faster than vision, meaning that infants can typically perceive and discriminate sounds before they are able to do the same for visual stimuli. Therefore, option D is the best choice.

Sensory Systems Develop on a "Staggered" Schedule