Final answer:
Option D is punctuated correctly with a comma after the introductory clause.
Step-by-step explanation:
The sentence that is punctuated correctly is option D: Because I didn't stop at the red light, I got a ticket. This sentence uses the correct punctuation by placing a comma after the introductory clause 'Because'. The comma indicates a pause in the sentence and helps to clarify the sentence's meaning.
Learn more about Punctuation in English sentences