An operation analyst is forecasting this year's demand for one of his company's products based on the following historical data: $(4$ year ago Quantity sold was $1057),(3$ year ago Quantity sold was $1161),(2$ year ago Quantity sold was $1720)$ and the last year Quantity sold was $1961.$ The previous trend line had predicted $1203$ for three years ago, $1257$ for two years ago and $1310$ for last year. What was the mean squared error $($MSE$)$ for these forecasts?

a$.213311\mathrm{.}33$

b$.0\mathrm{.}20999999$

C$.385\mathrm{.}32999$

d$.21\mathrm{.}24$