John earned $100,000 last year and paid $10,000 in income taxes. Mark earned $50,000 last year and paid $5,000 in…

John earned $100,000 last year and paid $10,000 in income taxes. Mark earned $50,000 last year and paid $5,000 in income taxes. This is an example of what principal of taxation? A) benefits-received principle B) ability-to-pay principle C) progressive D) regressive E) none of the above