Answer the question on the basis of the following data: $$\begin{array}{cc}\text{ Taxable Income }& \text{ Total Tax }\\ \$1,000& \$0\\ 2,000& 100\\ 3,000& 300\\ 4,000& 600\\ 5,000& 1,000\\ 6,000& 1,500\end{array}$$ The tax represented is:

A) optimal.
B) proportional.
C) regressive.
D) progressive.

Progressive Tax

A taxation system where the tax rate increases as the taxable amount increases, typically structured to impose a heavier tax burden on higher-income earners.

Taxable Income

The portion of income that is subject to taxation after all allowances, deductions, and exemptions are factored in.

Total Tax

The sum of all the taxes levied by different levels of government on an individual or business.