According to the Textbook,"definitions Matter" When It Comes to Discussing

According to the textbook,"definitions matter" when it comes to discussing poverty.Why do these definitions matter?

A) because social policies and programs have to refer to specific definitions to set up criteria for inclusion and exclusion
B) because people need to know how to categorize themselves so they are motivated to work harder
C) because people feel more secure when they know they belong to an identifiable, defined group
D) because people need to be able to compare themselves to others so they understand their position