The correct option is
A Winter
- Frogs hibernation is a common response to the cold winters.
- Aquatic frogs and American bullfrogs typically hibernate underwater.
- These frogs must be near oxygen-rich water and spend a lot of time of the winter just lying on the top of the mud or just partially buried.
- Terrestrial frogs normally hibernate on land and other frogs are good diggers and burrow deep into the soil, below the frost line.
So, the correct answer is option A.