Final answer:
The scenarios A and C are examples of progressive taxes, while B and D are examples of regressive taxes.
Step-by-step explanation:
The scenarios A) Progressive: Higher income taxed at a higher rate and C) Progressive: Lower income taxed at a higher rate are examples of progressive taxes. In a progressive tax system, higher income individuals pay a higher percentage of their income in taxes. Scenarios B) Regressive: Flat rate applied to all income levels and D) Regressive: Lower income taxed at a lower rate are examples of regressive taxes. In a regressive tax system, lower income individuals pay a higher percentage of their income in taxes compared to higher income individuals.