The Dean of a School of Business Is Forecasting Total

The dean of a school of business is forecasting total student enrollment for this year's summer session classes based on the following historical data: $$\begin{array} { | l | c | } \hline { \text { Year } } & \text { Enrollment } \\\hline \text { Four years ago } & 2000 \\\hline \text { Three years ago } & 2200 \\\hline \text { Two years ago } & 2800 \\\hline \text { Last year } & 3000 \\\hline\end{array}$$
What is this year's forecast using a three-year simple moving average?

A)  2,667
B)  2,600
C)  2,500
D)  2,400
E)  2,333