Question

Which sentence below shows correct use of an em dash? (4 points)

He didn't hear the doorbell broken – since last week when – the delivery person arrived.
He didn't hear the door-bell broken since last-week when the delivery-person arrived.
He didn't hear the doorbell—broken since last week—when the delivery person arrived.
He didn't hear the door-bell broken since last week – when the delivery person arrived.