Answer the Question on the Basis of the Following Information $\begin{array} { c c } \text { Input Quantity } & \text { Real Domestic Output } \\ 100 & 200 \\150 & 300 \\200 & 400\end{array}$

Multiple Choice

Answer the question on the basis of the following information about the relationship between input quantities and real domestic output in a hypothetical economy: $\begin{array} { c c } \text { Input Quantity } & \text { Real Domestic Output } \\ 100 & 200 \\150 & 300 \\200 & 400\end{array}$ Refer to the table.The level of productivity in the economy is:

A) 2.
B) .5.
C) 4.
D) 200.