A rodenticide is effective against which of the following?

A rodenticide is designed to target a variety of rodent species, which typically includes both rats and mice. This is because most rodenticides are formulated to be effective against common pests that can damage property and present health risks, such as house mice and different species of rats, including the Norway rat and the roof rat.

The effectiveness of rodenticides against these two types of rodents arises from their various feeding habits and physiological characteristics, making them susceptible to the poisons used in these products. Since both rats and mice are prevalent nuisances in many environments, rodenticides are particularly useful for controlling their populations effectively.

This is why choosing an answer that states rodenticides work against both rats and mice captures the full range of what these products are designed to address. Other choices, such as limiting the effectiveness to just one species or erroneously stating that it works against voles only, do not accurately reflect the broad application of rodenticides.