Table 31 -The Following Table Shows Tax Payments Made for Various Incomes

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

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