The correct answer is: A. a
The word “a” is used before singular nouns that are not specific. In this case, the cat is not specific because it is not clear which cat Harsh
saw. It could be any cat, or it could be a cat that Harsh has not seen before.The word “an” is used before singular nouns that begin with a vowel sound.
In this case, the word “cat” does not begin with a vowel sound, so “an” is not the correct answer.The word “the” is used before singular nouns that are specific. In this case, the cat is not specific because it is not clear which cat Harsh saw. It could be any cat, or it could be a cat that Harsh has not seen before.
The answer “none of the above” is not correct because the word “a” is the only word that can be used in this sentence.