The correct option is D 1, 2, and 3
Statement 1 is correct: Migration leads to the intermixing of people from diverse cultures. It has positive contributions such as the evolution of composite culture and breaking through the narrow considerations and widens up the mental horizon of the people at large.
Statement 2 and 3 are correct: Migrants act as agents of social change. Fresh and constructive ideas related to new technologies, family planning, women's education, etc., are diffused from urban to rural areas through them. Migration also leads to the redistribution of the population within a country as people move from one region to another.