read the passage.

many ethnic groups lived in arctic regions. the inuit lived near the atlantic ocean in greenland, and the saami lived in the arctic regions of norway. in north america, three main ethnic groups lived in the arctic region: aleuts, native americans, and inuits. the aleuts inhabited the area around the bering sea, while native americans occupied the grasslands.

which best expresses the main idea?

a.
inuits, saami, aleuts, and native americans represent different ethnic groups.

b.
arctic regions were inhabited by many different groups of people.

c.
greenland, norway, and north america all have arctic regions.

d.
people can live in arctic regions.