Final answer:
The career change described represents an example of horizontal social mobility, where the change in occupation does not affect the individual's social class or status.
Step-by-step explanation:
The reporter who changes careers from a police beat reporter at a newspaper to an editor of nonfiction books and maintains the same salary has experienced c. horizontal social mobility. This type of mobility refers to changes in a person's occupation or role that do not result in a change in social class or status. As her salary remained the same, she did not move up or down the social ladder, indicating that it is not a case of upward or downward, nor structural or intragenerational mobility. In this case, the reporter moved from covering the police beat at a newspaper to becoming an editor of nonfiction books. Although she is being paid the same salary, she has changed careers and moved horizontally within the same social class.