Ans: D
Note that $y=g(x) = \frac{1}{3} f(x)$. Therefore, $g(x)$ is the image of reducing $f(x)$ to $\frac{1}{3}$ times along the $y$-axis. Hence, the two $x$ intercepts of $f(x)$ remains unchanged and the $y$ intercept of $f(x)$ is reduced from $15$ to $5$. Therefore, D is the answer.
Note that $y=g(x) = \frac{1}{3} f(x)$. Therefore, $g(x)$ is the image of reducing $f(x)$ to $\frac{1}{3}$ times along the $y$-axis. Hence, the two $x$ intercepts of $f(x)$ remains unchanged and the $y$ intercept of $f(x)$ is reduced from $15$ to $5$. Therefore, D is the answer.
