The correct answer is: b) Myanmar and Bhutan.
Assam is a state in northeastern India. It is bordered by the states of Arunachal Pradesh to the north, Nagaland to the northeast, Manipur to the east, Mizoram to the southeast, Tripura to the south, Meghalaya to the southwest, and West Bengal to the west. It also shares international borders with Bhutan to the north and Myanmar to the east.
Nepal and China are both landlocked countries in Asia. Nepal is located to the west of Assam, while China is located to the north. Bangladesh is a country in South Asia. It is located to the south of Assam.
Here is a map of Assam showing its international borders:
The map shows that Assam shares an international border with Bhutan to the north and Myanmar to the east.