The Table Gives Information About the Relationship Between Input Quantities

Multiple Choice

$$\begin{array} { | c | c | } \hline \text { Input Quantity } & \text { Real Domestic Output } \\\hline 100 & 200 \\\hline 150 & 300 \\\hline 200 & 400 \\\hline\end{array}$$ The table gives information about the relationship between input quantities and real domestic output in a hypothetical economy. The level of productivity in the economy is

A) 2.
B) 0.5.
C) 4.
D) 200.