I would have to say A would probably be the best answer because the others are just a regular sentence telling them about the positive things about volunteering but A has a quote and to me that helps get people interested better.
Answer:
2. My bicycle was stolen last night
3. St Paul's Cathedral was designed by Christopher Wren
4. Why were the pyramids built?
5. Our old house was destroyed by fire.
6. The new rules were introduced last week.
