Nitrosyl Bromide Decomposes According to the Chemical Equation Below

Nitrosyl bromide decomposes according to the chemical equation below. 2NOBr(g) ⇌ 2NO(g) + Br₂(g)
1.00 atm of NOBr is sealed in a flask.At equilibrium,the partial pressure of NOBr is 0.82 atm.What is the equilibrium constant for the reaction?

A) 3.6 × 10−³
B) 8.7 × 10−³
C) 2.8 × 10−²
D) 3.5 × 10−²
E) 4.3 × 10−³