The Following Table Shows Tax Payments Made for Various Incomes

The following table shows tax payments made for various incomes.According to the information in the table below,the tax system is:
Table 3.1
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$$\begin{array} { | l | r | r | r | r | } \hline \text { Taxable income } & \$ 1,000 & \$ 2,000 & \$ 4,000 & \$ 8,000 \\\hline \text { Tax payments } & \$ 10 & \$ 30 & \$ 90 & \$ 270 \\\hline\end{array}$$

A) progressive throughout all levels of income.
B) progressive between $1,000 and $2,000 of income but regressive above $2,000.
C) regressive throughout all levels of income.
D) regressive between $1,000 and $2,000 of income but progressive above $2,000.
E) proportional throughout all levels of income.