Answer:
D. I hope that you do not oversleep, or we will be late for school.
Step-by-step explanation:
Sentence D is punctuated correctly because it uses a comma before the coordinating conjunction "or" to separate two independent clauses. The first independent clause is "I hope that you do not oversleep," and the second independent clause is "we will be late for school." The comma before "or" helps to indicate the pause between the two clauses and separates them appropriately.