Question

What primarily set off large-scale migration flows among European countries during the twentieth century?

A. the ability to establish distinctive political structures
B. the familiar cultural traditions of the host countries
C. the motivation to reach quotas set by individual countries
D. the desire to reunite with family members who migrated previously
E. the removal of migration restrictions​

Answer 1

D. the desire to reunite with family members who migrated previously

Step-by-step explanation: