What Factors Have Contributed to the Separation of Mothers and Children

What factors have contributed to the separation of mothers and children in transnational families?

A) Increasing population density in cities create the demand for migrant workers as service laborers, but the cities are not suitable to bring children.
B) Globalization and manufacturing changes create the demand for low-wage service workers, but many countries do not permit children and spouses to enter with the female workers or allow female workers to become pregnant or marry.
C) Filipino cultural customs look down upon children moving towns or countries before a certain age, but cities do not have enough jobs for mothers to work in their hometowns.
D) Market pressures in the Philippines crashed the economy and mothers are forced to find jobs outside of the country, but do not bring their children because of language barriers.