The Concept of Marginal Taxation Is Best Exemplified by Which

The concept of marginal taxation is best exemplified by which one of the following?

A) Kirby's paid $120,000 in taxes while its primary competitor only paid $80,000 in taxes.
B) Johnson's Retreat only paid $45,000 on total revenue of $570,000 last year.
C) Mitchell's Grocer increased its sales by $52,000 last year and had to pay an additional $16,000 in taxes.
D) Burlington Centre paid no taxes last year due to carryforward losses.
E) The Blue Moon paid $2.20 in taxes for every $10 of revenue last year.