Question

This is .............. egg that I bought yesterday A) an
B) the

Answer 1

B) the


grammatically speaking both are correct , but the egg is being described as being bought yesterday , and when we are talking abt something that we have already talked abt we use `the’ article

Answer 2

This is an egg that I bought yesterday.

1. in the above sentence the article an is used.
2. articles are words that are used either before a noun or a pronoun.
3. there are three articles - a, an and the.
4. we use the article an before the words which start with a vowel like- a, e, i, o and u.
5. the word egg is a common noun which begins with a vowel e

hence, the correct option is A) an