Rule reminder
When a prepositional phrase with 'di' is left-dislocated, the clitic 'ne' resumes it in the sentence: 'Di questo argomento, ne abbiamo già parlato.' Similarly, 'ci' can resume prepositional phrases with 'a/in/su': 'In quella città, ci ho vissuto tre anni.' The resumptive clitic is obligatory.
Which sentence correctly dislocates a prepositional phrase with 'di'?