The correct answer is option 1, Namcha Barwa. Namcha Barwa is the easternmost peak of the Himalayas. The Himalayas are a vast mountain range that spans several countries in Asia, including India, Nepal, Bhutan, and Tibet. Namcha Barwa is located in Tibet, China, near the border with India and Bhutan.
Option 2, Annapurna, is a different peak located in Nepal. Option 3, Kanchenjunga, is the third highest peak in the world and is located on the border of Nepal and India, but it is not the easternmost peak of the Himalayas. Option 4, Mount Everest, is the highest peak in the world and is located on the border of Nepal and China, but it is not the easternmost peak of the Himalayas.
In conclusion, Namcha Barwa is the correct answer as it is the easternmost peak of the Himalayas.