Which would be an adaptation for living in the tundra?

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Which would be an adaptation for living in the tundra?

funnel shaped leaves to help water runoff

deep roots to go into the permafrost

hibernation to lower metabolism in the winter

large ears to release heat

hibernation to lower metabolism in the winter

Explanation:

Hibernation is something many animals do to survive in the tundra. They hid in dens for several months during the winter. Their metabolisms get to a dormant state in which their bodies survive thanks to stores of fat gained during the summer. The Grizzly bear is an example of a tundra animal that hibernates during the winter.

a and b because with the other three, they simplify to something else.