Final answer:
The statement 'Businesses should treat their employees like family' best exemplifies a central idea as it offers a broad theme for a text on business ethics and employee treatment.
Step-by-step explanation:
The best example of a central idea among the options provided would be "Businesses should treat their employees like family." This statement expresses a broad and overarching theme or principle that could be the primary focus in a text discussing business practices and employee relations. In contrast, the other options represent more specific questions or scenarios that could be discussed within the broader context of the central idea.