Final answer:
Intergenerational mobility is the correct answer. It refers to the movement or change in social class between different generations within a family. When the children of working-class parents manage to attend college and get a job in a professional field, it is an example of intergenerational mobility.
Step-by-step explanation:
The correct answer is d. intergenerational mobility.
Intergenerational mobility refers to the movement or change in social class between different generations within a family. When the children of working-class parents manage to attend college and get a job in a professional field, it is an example of intergenerational mobility. It shows that they have moved up in social class compared to their parents' generation.