Factor the polynomial.

$x^2-2x-15$

• A. $\left(x-3\right)\left(x-5\right)$
• B. $\left(x-3\right)\left(x+5\right)$
• C. $\left(x+3\right)\left(x-5\right)$
• D. $\left(x+3\right)\left(x+5\right)$