Rosa simplifies $\dfrac{x^2 - 2x - 15}{x^2 - 9} \div \dfrac{2x - 10}{x + 3}$ and correctly obtains $\dfrac{x + 3}{2(x - 3)}$. Which values of $x$ must be excluded from the original expression?

• A$x = 3$ only
• B$x = 3$ and $x = -3$ only
• C$x = 3$, $x = -3$ and $x = 5$
• D$x = 3$, $x = -3$, $x = 5$ and $x = -5$

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