Correct Answer: There are three cars parked outside: a Mercedes, a Jaguar and a Fiat.

Solution : The correct choice is the third option .

Explanation :

• "A" is the indefinite article used before singular countable nouns. In this case, "Mercedes," "Jaguar," and "Fiat" are all singular countable nouns representing specific car models. All these words start with consonant sounds. So, the indefinite article "a" would be used.

Therefore, the sentence "There are three cars parked outside: a Mercedes, a Jaguar, and a Fiat" is the only one that uses the indefinite articles correctly.