Nearly any kind of plant of the forest understory can be part of a deers diet. Where the f

Nearly any kind of plant of the forest understory can be part of a deers diet. Where the forest inhibits the growth of grass and other meadow plants, the black-tailed deer browses on huckleberry, salal, dogwood, and almost any other shrub or herb. But this is fair-weather feeding. What keeps the black-tailed deer alive in the harsher seasons of plant decay and dormancy？ One compensation for not hibernating is the built-in urge to migrate. Deer may move from high-elevation browse areas in summer down to the lowland areas in late fall. Even with snow on the ground, the high bushy understory is exposed; also snow and wind bring down leafy branches of cedar, hemlock, red alder, and other arboreal fodder.

It can be inferred from the discussion in paragraph 2 that winter conditions

A．cause some deer to hibernate

B．make food unavailable in the highlands for deer

C．make it easier for deer to locate understory plants

D．prevent deer from migrating during the winter

请帮忙给出正确答案和分析，谢谢！