Your first option is correct.
EXPLANATION:
your first option is correct because this is a grammar question. When you use "an" you're using it in front of a vowel. The only sentence starting with a vowel is the first one. The others don't sound right when you use "an" in front of it instead of "a".
I hope I helped! :)
Answer:
What does this mean pls
Explanation:
Explain your question and i might help
A four letter word for market or store is a shop
Where is the sentence you are referring to in the question?
