Answer:
C) persuade readers to purchase an all-natural pest prevention product
Step-by-step explanation:
I looked up the passage you meant, and I found it just by putting your question in the search bar. I would link it, but links aren't allowed.
The main point of this passage is ultimately to do choice C), persuade readers to purchase an all-natural pest prevention product. It devotes most of the paragraphs to that goal.
This passage starts off by B) telling readers about the types of animals that spread disease, but it just uses that as a starting point for its campaign to get readers to buy the products. Yes, it also A) informs readers of the dangers of commercial chemicals, but only so that it can bring up its all-natural remedies.
D) is not mentioned, so rule that out off the bat.