ACT English Practice Question

Read the following excerpt and consider the bolded portion. Which choice is least redundant in context? In each chamber, up to five of the sparrow-sized birds can huddle **as a group together when the Kalahari nights get cold**.

1. A.No Change
2. B.all together, staying warm when the temperature drops and gets colder at night.
3. C.and stay warm when temperatures plummet at night and it’s cold.
4. D.for warmth during the cold Kalahari nights.