Hibernation is a state of inactivity in animals, characterized by lower body temperature, slower breathing, and lower metabolic rate. It helps animals to survive the winter period when food is scarce, by reducing the need for energy.

Option 1 suggests that only bats and bears hibernate. This is only partially correct because, while bats and bears do hibernate, other animals do too.

Option 2 proposes that only bears hibernate. However, this is not entirely true as some species of bats and rodents also exhibit this phenomenon.

Option 3, which is the correct answer, includes bats, bears, and rodents; all these types of animals can hibernate. Numerous species in these categories tend to hibernate to survive harsh winter conditions.

Option 4 asserts that none of the mentioned animals hibernate, which is incorrect. All these animals—bats, bears, and rodents—are known to hibernate in unfavorable environmental conditions.