D. In winter black bears ... 1) don't leave their hidden homes. 2) hunt for food. 3) have a high body temperature.

1) don't leave their hidden homes. Объяснение: В тексте сказано: "In late November and early December, black bears go to their dens (hidden homes) to spend the winter sleeping. ... This way, they don't have to leave their dens and hunt for food when the weather is cold." Это значит, что зимой черные медведи не покидают свои убежища.