Option 1, Arunachal Pradesh is incorrect. Although this state is home to many Buddhist monasteries, Tabo Monastery is not one of them. Option 2, Himachal Pradesh, is the correct answer. The Tabo Monastery located in the Lahaul and Spiti District, which is a part of Himachal Pradesh. This ancient, significant site is renowned for its breathtaking murals and stucco sculptures that date back to the 10th century. Option 3, Sikkim, is also a wrong answer. Sikkim does have many acclaimed and important Buddhist sites such as Rumtek Monastery but not Tabo Monastery. Lastly, Option 4, Uttarakhand is not the right answer. Uttarakhand, especially the region of Garhwal, is known more for its Hindu pilgrimage sites rather than Buddhist ones.