Concept:The snow-line is the altitude above which snow stays all year. In the Himalayas, it varies by latitude and climate.Explanation:The Himalayan region of Uttar Pradesh (now mostly Uttarakhand) has an average snow-line around 4500–5000 meters.This is lower than in drier ranges like Karakoram, where the snow-line is 5500–6000 meters.Higher latitude or more moisture lowers the snow-line.Answer:D. 4500 m