Solve the Equation $|\mathrm{n}-9|=|1-\mathrm{n}|$ A) $\{10\}$ B) $\{5\}$ C) $\{-4\}$ D) $\varnothing$

Solve the equation.
- $|\mathrm{n}-9|=|1-\mathrm{n}|$

A) $\{10\}$
B) $\{5\}$
C) $\{-4\}$
D) $\varnothing$