The correct answer is: D. no article
Assam is a state in northeastern India. It is located in the eastern part of the country, and is bordered by Bhutan to the north, Arunachal Pradesh to the northeast, Nagaland to the east, Manipur and Mizoram to the south, Tripura to the southwest, Meghalaya to the west, and West Bengal to the northwest.
The use of articles in English is governed by a complex set of rules. In general, articles are used to introduce specific nouns, while no articles are used to introduce general nouns. In the case of Assam, it is a general noun, as it refers to a state in India, not a specific state. Therefore, the correct answer is “no article.”
The other options are incorrect because they are all articles. “A” and “an” are indefinite articles, which are used to introduce general nouns. “The” is a definite article, which is used to introduce specific nouns. In the case of Assam, it is a general noun, as it refers to a state in India, not a specific state. Therefore, the correct answer is “no article.”