Question

Which of the following is true about immigration?

A . immigrants are only allowed to enter countries if their hometown is overly populated

B. immigrants are not allowed to enter developed Nations

C. immigrants come from a variety of countries

D. immigration has greatly slowed in the past 100 years

Answer 1

I think C better fits here than the others, even though D sounds fine also. But C is better.
Hope i helped

Answer 2

I would say C, because immigrants, not only come from Russia, or Europe, they can come from even Africa, India, South America, and much more.
Hope that this would help you! =)