Final answer:
Out of the provided options, Sentence A and the first part of Sentence B are correctly punctuated. Sentence A uses the comma appropriately after the introductory clause, and the first part of Sentence B correctly places a comma before the date. However, the second part of Sentence B is incorrectly punctuated and requires a period instead of a comma. Sentence C is incorrect because it incorrectly places a comma before 'that', which should not be there. Sentence D is missing necessary commas in its series.
Step-by-step explanation:
To determine which of the provided sentences are correctly punctuated, let's analyze them one by one:
- Sentence A: When she returned to work after maternity leave, she learned that her office had been relocated to the second floor. - This sentence is correctly punctuated. It correctly uses a comma after the introductory clause.
- Sentence B has two issues. The first part before the date is correctly punctuated. However, there should be a period instead of a comma separating the two independent clauses. It should be: Please submit your expense report proposal before October 15, 2008. Maurice listened to the team’s proposals, and then he promptly turned them down.
- Sentence C: Not one employee was willing to sit at the desk, that had belonged to the man who turned out to be a serial killer. - This sentence is incorrectly punctuated. There should not be a comma before 'that' as it introduces an essential clause.
- Sentence D: All participants must sign in, register their vehicles, and report to their assigned locations before 7:30 a.m. - This sentence is missing commas after 'sign in' and 'register their vehicles' for the list of activities that all participants must complete.
Therefore, the sentences correctly punctuated are Sentence A and the first part of Sentence B.