The best answer, and most likely answer would be D. I hope this helps! :)
the undercover agent still investigating the case is a run-on sentence
usually what I would do is take the information than summarize it and make sure to get all important information in there and maybe even add pictures do help you remember hope this helps!
Answer:
Definitions or restatements.
Synonyms.
Antonyms or opposites.
Examples or explanations.
Answer: what cause withholds you then to mourn him?
Explanation: in the sentences above Antony was explaining how Caesar was once loved by all but now no one was grieving him, this sentence is him asking why no one is mourning him insinuating that he was telling them to mourn him