The correct answer is option 4, which states that Nagpur is located on the leeward side of the Sahyadri Mountains.

The Sahyadri Mountains are located along the western coast of India, meaning they act as a barrier to the moisture-laden winds coming from the Arabian Sea. When winds hit a mountain range, they are forced upwards, which causes the moisture in the air to condense and form clouds, leading to rainfall on the windward side of the mountains. However, once the air passes over the mountains and descends on the leeward side, it becomes dry and loses most of its moisture. This results in areas on the leeward side, like Nagpur, receiving scanty rainfall.

Therefore, Nagpur experiences less rainfall because it is located on the leeward side of the Sahyadri Mountains, where the descending air becomes dry and loses its moisture.