Answer
model B.
Work Step by Step
Using a graphing utility - table option, we have
$ \left[\begin{array}{lllllll}
year & 0 & 2 & 4 & 6 & 7 & \\
spending & 16 & 18 & 22 & 28 & 30 & \\
\hline & & & & & & \\
S(t) & & & & & & \\
A & 16 & 17.2 & 16.8 & 14.8 & 13.2 & \\
B & 16 & 18.8 & 23.2 & 29.2 & 32.8 & \\
C & 16 & 18 & 20 & 22 & 23 &
\end{array}\right] $
We also graph each model.
(See image below.)
The best model is the one with the blue graph, model B.
