The Reaction for the Decomposition of PCl₅ to Chlorine and PCl₃

The reaction for the decomposition of PCl₅ to chlorine and PCl₃ is shown below.
PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)
If the equilibrium concentrations are [PCl₅] = 1.0 M, [PCl₃] = 0.10 M, [Cl₂] = 0.10 M, what is the value of the equilibrium constant?

A) 1.0 × 10^-2
B) 1.0 × 10^-4
C) 10 × 10^-2
D) 1.0 × 10²
E) 2.0 × 10^-2