The factors that have changed to heterogamy include a higher college enrollments, geographical mobility, and participation of women in the work force.
Option D is correct.
Heterogamy is defined as the marriage between people of  different characteristics.
These characteristics include different sociological backgrounds, educational levels and different races. Geographical mobility has aided Heterogamy in a beneficial way.
Interracial marriages are more common when people of different races meet as a result of travel.
Therefore, option D is correct.
Learn more about the heterogamy, refer to:
https://brainly.com/question/25626127
