The following map shows net migration rates throughout the world in 2008. why are the net migrations positive in western europe and negative in eastern europe?

political map showing net migration rates throughout the world in 2008. colors show the migration rates in countries. orange countries have a negative rate, green have a zero rate, and blue have a positive rate. the united states and western europe are primarily blue.

a. forced migration in eastern europe

b. higher wages in western europe

c. more factories and industry in western europe

d. better education and cultural opportunities in western europe