Which sentence uses commas correctly?

Which sentence uses commas correctly?

• A. After dinner we went for a walk and we enjoyed the cool evening.
• B. After dinner, we went for a walk, and we enjoyed the cool evening.
• C. After dinner, we went for a walk and we enjoyed the cool evening.
• D. After dinner we went for a walk, and we enjoyed the cool evening.

Answer: (B)

When you start a sentence with an introductory phrase, you put a comma after that introductory part. Also, when two independent clauses are joined by a coordinating conjunction like and, you place a comma before that conjunction. In this sentence, the introductory phrase is After dinner, so a comma should come right after dinner. There are two independent clauses—we went for a walk and we enjoyed the cool evening—so a comma is needed before the coordinating conjunction and that links them. The sentence that follows both rules has the comma after the introductory phrase and the comma before the and, making it clear and properly punctuated. The other options miss one of these comma placements, which is why they’re not correct.

When you start a sentence with an introductory phrase, you put a comma after that introductory part. Also, when two independent clauses are joined by a coordinating conjunction like and, you place a comma before that conjunction.

In this sentence, the introductory phrase is After dinner, so a comma should come right after dinner. There are two independent clauses—we went for a walk and we enjoyed the cool evening—so a comma is needed before the coordinating conjunction and that links them.

The sentence that follows both rules has the comma after the introductory phrase and the comma before the and, making it clear and properly punctuated. The other options miss one of these comma placements, which is why they’re not correct.