$1$ Fill in the Blank $2\mathrm{.}5$ points

Look at the table. Be sure to type the correct answer such as a$,$ b$,$ c$,$ d$,$ or e$.$ Do not type your answer. Ensure your answers adhere to the multiplechoice format, even if you encounter different decimal points.

$\backslash$table$[[$Month$,$Sales,Forecast$],[$January$,975,977],[$February$,986,990],[$March$,989,985]]$

The table's mean squared error $($MSE$)$ is type your answer...

a$)24$

b$)36$

c$)48$

d$)52$

e$)72$