The Table Shows a Consumption Schedule

Multiple Choice

$$\begin{array} { | c | c | } \hline \text { Disposable Income } & \text { Consumption } \\\hline \$ 300 & \$ 310 \\\hline 350 & 340 \\\hline 400 & 370 \\\hline 450 & 400 \\\hline 500 & 430 \\\hline\end{array}$$ The table shows a consumption schedule. The marginal propensity to consume is

A) 0.80.
B) 0.75.
C) 0.60.
D) 0.40.