The answer is D. Afghanistan.
The other four countries are all landlocked, while Afghanistan is bordered by Iran to the west, Pakistan to the east and south, Turkmenistan, Uzbekistan, and Tajikistan to the north.
Laos is a landlocked country in Southeast Asia. It is bordered by Myanmar to the northwest, China to the north, Vietnam to the east, Cambodia to the south, and Thailand to the west.
India is a country in South Asia. It is the second-most populous country in the world, with over 1.3 billion people. India is bordered by Pakistan to the west, China, Nepal, and Bhutan to the north, Bangladesh and Myanmar to the east, and Sri Lanka and the Maldives to the south.
Nepal is a landlocked country in South Asia. It is bordered by China to the north and India to the south, east, and west.
Bolivia is a landlocked country in South America. It is bordered by Brazil to the north and east, Paraguay to the southeast, Argentina to the south and southwest, and Chile to the west.