Explanations:The question asks about the common frontiers shared by the Indian states of Uttarakhand, Uttar Pradesh, Bihar, Sikkim, and West Bengal. To understand the correct answer, it is essential to know the geographical layout of these states and their neighboring countries.
India is a large country with diverse geographical features, including mountains, plains, and coastal regions. The northern and eastern parts of India are characterized by the Himalayan mountain range, which forms a natural boundary with several neighboring countries. Among these countries, Nepal is a significant neighbor to several Indian states.
Nepal is a landlocked country located in South Asia, situated between India and China. It is known for its mountainous terrain, including the Himalayas, and is a popular destination for mountaineers and trekkers. Nepal shares a long and complex border with India, which includes the states of Uttarakhand, Uttar Pradesh, Bihar, Sikkim, and West Bengal.
Uttarakhand, located in the northern part of India, shares a border with Nepal in the north. The border between Uttarakhand and Nepal is characterized by the Himalayan mountain range, including peaks such as Nanda Devi and Kamet. Uttar Pradesh, another northern state, also shares a border with Nepal, particularly in the western and central parts of the state.
Bihar, located in the eastern part of India, shares a border with Nepal in the north. The border between Bihar and Nepal is relatively long and includes several important cities and towns. Sikkim, a small state located in the northeastern part of India, shares a border with Nepal in the west. The border between Sikkim and Nepal is characterized by the Himalayan mountain range, including peaks such as Kanchenjunga.
West Bengal, another eastern state, shares a border with Nepal in the north. The border between West Bengal and Nepal is relatively short but includes important areas such as Darjeeling and Jalpaiguri. These states collectively form a significant portion of India's border with Nepal.
Other neighboring countries like China, Bhutan, and Myanmar do not share borders with all the mentioned Indian states. China shares borders with some northern and northeastern states, but not with all the states mentioned in the question. Bhutan shares borders with Sikkim and some northeastern states, but not with all the states mentioned. Myanmar shares borders with northeastern states, but not with the states mentioned in the question.
Therefore, the correct answer is Nepal, as it shares borders with all the mentioned Indian states: Uttarakhand, Uttar Pradesh, Bihar, Sikkim, and West Bengal.