Solution:
Option A is the correct answer. In simple words, we can say that articles mean the words - A, An, and The. They are placed before a noun to show whether the noun referred to in a sentence is specific or general. We use "a" before nouns that begin with consonants. Example - a banana, a cat. Option B is incorrect because "an" is likely before nouns that start with vowels{A, E, I, O, U}. "The" transpires when we talk about a particular thing. Eg. The food that we ate was delicious.