Phosphorus Pentachloride Decomposes to Phosphorus Trichloride at High Temperatures According

Phosphorus pentachloride decomposes to phosphorus trichloride at high temperatures according to the equation:
PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)
At 250° 0.125 M PCl₅ is added to the flask.If K_c = 1.80,what are the equilibrium concentrations of each gas?

A) [PCl₅] = 0.0 0765 M,[PCl₃] = 0.117 M,and [Cl₂] = 0.117 M
B) [PCl₅] = 0.0625 M,[PCl₃] = 0.335 M,and [Cl₂] = 0.335 M
C) [PCl₅] = 1.80 M,[PCl₃] = 1.80 M,and [Cl₂] = 1.80 M
D) [PCl₅] = 3.96 M,[PCl₃] = 3.83 M,and [Cl₂] = 3.83 M