Given the Following Historical Data, What Is the Simple Three-Period

Multiple Choice

Given the following historical data, what is the simple three-period moving average forecast for period 6? $$\begin{array} { | l | c | } \hline { \text { Year } } & \text { Attendance } \\\hline \text { Four Years ago } & 10,000 \\\hline \text { Three Years ago } & 12,000 \\\hline \text { Two Years ago } & 18,000 \\\hline \text { Last Year } & 20,000 \\\hline\end{array}$$

A)  67
B)  115
C)  69
D)  68
E)  68.67