Ans: D
$\begin{array}{cl}
& g(1-3\alpha) \\
= & 13-5(1-3\alpha)^2 \\
= & 13 -5(1-6\alpha+9\alpha^2) \\
= & 13 -5 +30\alpha-45\alpha^2 \\
= & 8+30\alpha-45\alpha^2
\end{array}$
