Using a Three-Month Moving Average, the Forecast Value for November

Multiple Choice

Using a three-month moving average, the forecast value for November in the following time series is ____________. $$\begin{array} { | r | r | } \hline \text { July } & 5 \\\hline \text { Amg } & 11 \\\hline \text { Sent } & 13 \\\hline \text { Oct } & 6 \\\hline\end{array}$$

A) 11.60
B) 10.00
C) 9.67
D) 8.60
E) 6.00