The correct answer is: 1, 3, 2, 4.
Shilla is the highest peak in the Karakoram Range, with a peak elevation of 7,801 meters (25,610 feet). Manerang is the second highest peak in the Karakoram Range, with a peak elevation of 7,690 meters (25,260 feet). Reo Purgyil is the third highest peak in the Karakoram Range, with a peak elevation of 7,655 meters (25,110 feet). Shipki Pass is a mountain pass in the Karakoram Range, with an elevation of 5,400 meters (17,700 feet).
Option A: 1, 4, 3, 2 is incorrect. This option lists the peaks in the following order: Shilla, Shipki, Manerang, Reo Purgyil. However, Shilla is the highest peak in the Karakoram Range, and Shipki Pass is a mountain pass. Therefore, Shilla should be listed first, and Shipki Pass should not be listed at all.
Option B: 1, 3, 2, 4 is incorrect. This option lists the peaks in the following order: Shilla, Manerang, Reo Purgyil, Shipki. However, Manerang is the second highest peak in the Karakoram Range, and Shipki Pass is a mountain pass. Therefore, Manerang should be listed second, and Shipki Pass should not be listed at all.
Option C: 1, 3, 4, 2 is incorrect. This option lists the peaks in the following order: Shilla, Manerang, Shipki, Reo Purgyil. However, Reo Purgyil is the third highest peak in the Karakoram Range, and Shipki Pass is a mountain pass. Therefore, Reo Purgyil should be listed third, and Shipki Pass should not be listed at all.
Option D: 1, 2, 3, 4 is correct. This option lists the peaks in the following order: Shilla, Manerang, Reo Purgyil, Shipki. This is the correct order of the peaks in descending order of their height.