Siying's mother and father both lacked any formal education and supported their family by working as shoe shiners in a New York City subway station. Siying got a scholarship to attend an Ivy League university, went to medical school, and is now a neurosurgeon at a hospital in Boston. This is an example of:

Vertical social mobility.

Explanation:

Vertical social mobility is defined as mobility that take place in shifting from one social status to another social status in status hierarchy. This movement can be in upward shift or downward shift.

According to the question, vertical social mobility is displayed through the shifts occurring in social status of Siying and her family. Siying's social status got upgraded from getting scholarship and becoming neurosurgeon.

the correct answer is c.

this is not a question