Final answer:
The new sculptural development that occurred in the late Classical period was the Contrapposto pose.
Step-by-step explanation:
In the late Classical period, a new sculptural development that occurred was the Contrapposto pose. This pose involves shifting the weight of the body onto one leg while the other leg is bent, creating a more natural and dynamic stance. It was a significant departure from the stiff and frontal poses found in earlier periods of Greek art. The Contrapposto pose added a sense of movement and realism to sculptures, allowing artists to capture the natural curvature and rhythm of the human body.