I believe the answer is C because it has multiple answers in one, and the most effective early childhood curriculum can have more than one solution.
Occupational Health Handbook
Answer:
limit the bug bites and contact with infected birds
Explanation:
One way they could limit the bites is a way ther're already doing it with bug screens when they sleep over the beds, that and bug spray.
the birds could be solved with feeding stations outside of civilizations and scarecrows in the towns.
