Final answer:
Screening openings and vents are the best way to control roof rats as it focuses on prevention by blocking entry points and avoiding risks associated with poisons. The correct option is B. Screening opening and vents
Step-by-step explanation:
The best method for controlling roof rats is screening openings and vents, as stated in option B. This method focuses on prevention by blocking the entry points that rats use to access the structure.
Rats are adept climbers and often find their way into buildings through small openings.
By installing screens on vents and other openings, you ensure that these pests cannot enter. While baits and traps (options A, C, and D) can be effective in reducing a rat population once they have entered a structure, the most effective long-term solution is to prevent their entry in the first place.
Also, placing poisonous substances like bait can pose risks if not handled properly and could inadvertently affect non-target wildlife or pets. The correct option is B. Screening opening and vents