Ans: A
$\begin{array}{rcl}
f(-1) & = & 8 \\
(-1)^2 -9(-1) + c & = & 8 \\
10 + c & = & 8 \\
c & = & -2
\end{array}$
$\begin{array}{rcl}
f(-1) & = & 8 \\
(-1)^2 -9(-1) + c & = & 8 \\
10 + c & = & 8 \\
c & = & -2
\end{array}$
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