Which was a geographic factor in the development of different ways of life among native american groups?

a.
the great plains were barren with few animals to hunt, and people could not live there year round.

b.
the climate of the pacific northwest coast forced people to develop irrigation methods for farming.

c.
desert climates required people who lived there to learn to farm with little water.

d.
the forests of eastern north america could not support large communities of native peoples.