What areas have been the main sources of immigrations in recent years?

Other regions accounting for significant shares were Europe and Canada (13.5 percent), the Caribbean (9.6 percent), Central America (7.9 percent), South America (6.7 percent), the Middle East (4 percent) and sub-Saharan Africa (3.9 percent).

Explanation:

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )

the answer for 3 is b and the answer for 4 is d