The correct option is D Causes imbalances in the sex ratio
Migration may lead to weakening social ties, as migrants sometimes fall out of touch with the people who are left back at home. It can cause imbalances in the sex-ratio of a community or settlement.On a national scale, people moving out of the country often fall out of touch with the culture and tradition of their home country.Migration also leads to the parent country losing the services of the educated and the youth who have settled abroad.