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 profit before tax 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 carry-forward losses.
E) The Blue Moon paid $2.20 in taxes for every $10 of revenue last year.