How do many of the mammals that inhabit deciduous forests deal with the conditions of the winter season?

they migrate to warmer areas.
they forage or hunt at night.
they develop symbiotic relationships.
they hibernate or stockpile food.

D.) They hibernate or stockpile food.

Explanation:

This question can be confusing for some, so I'll go through the process of elimination to make it easier for everyone. Option A is definitely not correct; only birds migrate to warmer areas. Option B is incorrect because depending on the location of where the mammal is, they can possibly freeze and there won't be enough food to survive. Option C makes no sense; yes, animals can benefit from one another in a symbiotic relationship, but that's not going to keep them warm or alive.

Hope this helps :)