Answer the Question on the Basis of the Following Data

Answer the question on the basis of the following data: $$\begin{array} { c c } \text { Taxable Income } & \text { Total Tax } \\\hline \$ 1,000 & \$ 0 \\2,000 & 100 \\3,000 & 300 \\4,000 & 600 \\5,000 & 1,000 \\6,000 & 1,500\end{array}$$ Refer to the given data.If your taxable income is $4,000,your average tax rate will be:

A) 20 percent.
B) 15 percent.
C) 10 percent.
D) 5 percent.