Correct Answer:  a big
 

Solution : The correct answer is option 3.

 They have booked a big restaurant for the birthday celebration.

Explanation:

- In the preceding clause, it is mentioned that the reservation was made at a hotel to celebrate a birthday.
- The blank provides additional hotel details.
- An adjective is a word that adds additional detail to a noun or pronoun.
A cloudy day, a tall man, and a cool glass of water are examples.
- It is obvious from the options that "big" will be used as an adjective to describe the noun "hotel" in more detail.
- The words known as articles indicate whether a noun is singular or plural.
- Before a noun, the definite article (the) is used to show that the reader is aware of the noun's identity.

- The definite article (a, an) is used before a noun when its identity is ambiguous or general.
- A noun may occasionally be modified by both an article and an adjective.
- Article +adjective+noun is the traditional word order.
- If the article is ambiguous, we decide whether to use an or a based on the word that comes right after it.
- Big, an indefinite adjective that begins with a consonant sound, is used in the example sentence.
- Therefore, it will be preceded by the article "a."