Answer:
A
- The article "a" is used when a noun starts with consonants.
- it is used in front of SINGULAR countable nouns which are not specific.
e.g. "a ball", "a dog"
An
- used in front of nouns that start with vowels (a, e, i, o, u)
- like "a", it is used in front of SINGULAR countable nouns.
e.g. "an apple", "an orchard"
Note:
Do not use "a" and "an" with plural nouns. -- THIS IS WRONG.
e.g. "a dogs", "an apples"
