The correct answer is D. no article.
The word "Nepali" is a nationality, not a specific person or thing. Therefore, it does not need an article.
A is incorrect because "a" is used before singular nouns that refer to a general or unspecified person or thing. In this case, we are talking about a specific person, Akash, so we do not need "a."
B is incorrect because "an" is used before singular nouns that begin with a vowel sound. In this case, the word "Nepali" begins with a consonant sound, so we do not need "an."
C is incorrect because "the" is used before singular nouns that refer to a specific person or thing that has already been mentioned or is known to the listener. In this case, we are talking about a specific person, Akash, but he has not been mentioned before, so we do not need "the."
