Final answer:
The sentence that is punctuated correctly is: The plane is late because of the storm.
Step-by-step explanation:
The sentence that is punctuated correctly is: The plane is late because of the storm. This sentence follows standard punctuation rules, placing the subordinating conjunction 'because' before the independent clause 'the plane is late.' The other options have incorrect punctuation, such as placing a comma before 'is late' or using a comma after 'because.'
Learn more about Punctuation in English sentences