Simplify $\frac{x+5}{2x+10}$ by factoring out the greatest common factor, and state any excluded value.

• A. $\frac{1}{2x}$, with $x\ne 5$
• B. $2$, with $x\ne -10$
• C. $\frac{1}{2}$, with $x\ne -5$
• D. Cannot be simplified

Answer: (C)