He is sitting . . . . . . . . the park.

Solution (By Examveda Team)

The correct answer is A: in.
Let's understand why:

* Prepositions are words that show the relationship between a noun or pronoun and other words in a sentence. They often indicate location, direction, or time.

* "In" is generally used to describe something located inside a larger area or space.
Example: "The cat is in the house." (The cat is within the boundaries of the house).

* A park is a relatively large, enclosed area.
Therefore, someone sitting in the park is located within the park's boundaries.

* "On" is usually used for surfaces.
Example: "The book is on the table." (The book is resting on the surface of the table).

* "At" is used for specific points or addresses.
Example: "I'll meet you at the corner." (A specific location).

* "After" indicates time or sequence.
Example: "We'll go after dinner." (Following a specific time).

In the given sentence, "in" is the best preposition to show that the person is sitting within the park's area.