Punctuating sentences

Friday nights at the diner were always busy, I prefer the activity.

Is this answer correct?
Friday nights at the diner were always busy; I prefer the activity.

Yes, it is correct. Two independent clauses (which you have in this case) must be joined by a semicolon if they are to appear in one sentence.

Here is the revised sentence with the correct punctuation:

Friday nights at the diner were always busy; I prefer the activity.

To determine if the answer is correct, we need to look at the punctuation used in the sentence. In this case, the sentence provided is: "Friday nights at the diner were always busy, I prefer the activity."

Looking at the sentence, we can see that it contains two independent clauses:

- "Friday nights at the diner were always busy."
- "I prefer the activity."

When combining independent clauses in a single sentence, we have various options for punctuating them correctly:

1. Using a comma: "Friday nights at the diner were always busy, and I prefer the activity." This is typically used when the clauses are closely related and have a clear connection.

2. Using a semicolon: "Friday nights at the diner were always busy; I prefer the activity." This option works well when the clauses are more distinct but still connected in meaning.

3. Using a period: "Friday nights at the diner were always busy. I prefer the activity." This is suitable when the clauses are completely separate and not closely related in meaning.

In the provided answer, the correct option was chosen by using a semicolon to join the independent clauses: "Friday nights at the diner were always busy; I prefer the activity." This punctuation choice accurately reflects the relationship between the two clauses, indicating that they are distinct but connected in meaning.