Sentence improvement — Decide if the phrasal verb in ‘‘The demonstration passed off peacefully.’’ already conveys the correct meaning ‘‘took place/happened’’ and therefore requires no change.

Given data
The demonstration passed off peacefully.

Concept/Approach
‘‘Pass off’’ as an intransitive phrasal verb means ‘‘to happen/occur (often successfully or without incident)’’. That is exactly the intended meaning here, so no change is needed.

Option analysis
passed out — Means ‘‘fainted’’; irrelevant.passed away — Means ‘‘died’’; wrong.passed on — Means ‘‘died’’/‘‘transmitted’’ depending on context; wrong here.No improvement — Correct choice.

Common pitfalls
Confusing similar-looking phrasal verbs that diverge in meaning (off/out/on/away).

Final Answer
No improvement