The correct answer is: d) Myanmar.
Assam shares a 510-kilometer (317 mi) international border with Myanmar in the east. The border runs from the tripoint with Bhutan in the north to the tripoint with Bangladesh in the south. The border is mostly mountainous, with the Patkai Range forming the northern part of the border and the Lushai Hills forming the southern part. The border is also crossed by several rivers, including the Brahmaputra, the Barak, and the Chindwin.
Bhutan is a landlocked country in the eastern Himalayas. It is bordered by China to the north and India to the south, east, and west. Bhutan has a population of approximately 750,000 people and a land area of approximately 47,000 square kilometers (18,000 sq mi). The capital of Bhutan is Thimphu.
China is a country in East Asia. It is the world’s most populous country, with a population of over 1.4 billion people. China is also the world’s second-largest economy, after the United States. China is bordered by 14 countries: Afghanistan, Bhutan, India, Kazakhstan, Kyrgyzstan, Laos, Mongolia, Myanmar, Nepal, North Korea, Pakistan, Russia, and Tajikistan. The capital of China is Beijing.
Bangladesh is a country in South Asia. It is bordered by India to the west, north, and east, and Myanmar to the southeast. Bangladesh has a population of over 160 million people and a land area of approximately 147,570 square kilometers (57,000 sq mi). The capital of Bangladesh is Dhaka.
Myanmar is a country in Southeast Asia. It is bordered by China to the north, Laos and Thailand to the east, Bangladesh to the west, and India to the northwest. Myanmar has a population of over 54 million people and a land area of approximately 678,500 square kilometers (262,000 sq mi). The capital of Myanmar is Nay Pyi Taw.