Answer:
D) by encouraging them to post comments.
Step-by-step explanation:
The exact answer is D) by encouraging them to post comments.
The readers' participation can definitely be increased by encouraging them to post more and more comments. The theme of this book is the effect that the weather has on, and what causes heavy rain, torments, and hurricanes. It points to the evils that originate due to the hurricane hitting the city or town.