Given the function $y=g\left(x\right)$, how would the graph of $y=-5g\left(x\right)$ differ from the original graph?

• A. The graph is reflected across the $y$-axis and stretched vertically by a factor of $5$.
• B. The graph is reflected across the $x$-axis and stretched vertically by a factor of $5$.
• C. The graph is shifted $5$ units to the right.
• D. The graph is reflected across the $x$-axis and stretched horizontally by a factor of $5$.

Answer: (B)