Because of geography, which of the following contributed to the success of Native American groups in the Arctic region? A: The rich and fertile farming soil
B: The use of sled dogs for transportation
C: The mild climate
D: The development of irrigation systems

A : The rich and fertile farming soil

Explanation:

In many places where the ground freezes and thaws each year, most water is frozen. Plants must survive the winter with little water. ... Trees thrive in the rich, moist soil. In the Arctic, huge forests cover areas of seasonally frozen ground.

a. always outside of government control.