To scale Mount Everest, mountaineers need to go to ______.

Nepal

The correct answer is Option (3) → Nepal

To scale Mount Everest, mountaineers need to go to Nepal or Tibet. The two main routes for climbing Mount Everest are the South Col route in Nepal and the North Col route in Tibet (China). Nepal is the more popular and commonly used route by climbers attempting to summit Mount Everest. The base camp for the South Col route is located in Nepal's Khumbu region, while the base camp for the North Col route is situated in Tibet's Rongbuk Valley.