Question

The hunter-gatherer way of life made it impossible for people to live
in groups.
in cold climates.
in permanent dwellings.
without a spoken language.

Answer 1

In permanent dwellings.

The idea with that type of lifestyle is that you use the resources in one area and once they are exhausted, you have to move.

Check out native american culture before european settlement. The traditional housing, teepees and wigwams were designed to be taken apart and moved when the food was used up. Usually they followed bison migration.

Agriculture led to settlements becoming permanent, and the rise of civilization and cities.