Explanation:

Context:
The sentence states that the speaker is going to meet their friends, and the location of the meeting is Times Square. The task is to choose the correct preposition to complete the sentence.

Options:
a) on
b) at
c) in
d) over

Correct Answer:
The correct answer is option 'c' - in.

Explanation:
The most appropriate preposition to use in this context is "in" because Times Square is a specific location or area. When we refer to a specific place, we use the preposition "in" to indicate the location.

Examples:
- I am going to meet my friends in Times Square.
- Let's meet in the park.
- The party is in the restaurant.

Other Options:
a) on - This preposition is commonly used to refer to being on a surface or a particular day.
- Example: I am going to meet my friends on Monday.

b) at - This preposition is used to indicate a specific point or location.
- Example: I am going to meet my friends at the movie theater.

d) over - This preposition is used to indicate movement from one side to another or to show superiority.
- Example: Let's walk over the bridge.

In the given sentence, "in" is the most suitable preposition because it accurately describes the location of the meeting. Times Square is a specific area, and therefore, we use the preposition "in" to indicate that the speaker will be meeting their friends within that area.

Summary:
The correct preposition to complete the sentence is "in" as it accurately indicates the location of the meeting at Times Square.