Gaseous Hydrogen Bromide Decomposes at Elevated Temperatures According to the Following

Gaseous hydrogen bromide decomposes at elevated temperatures according to the following equation: . At a certain temperature a 2.00 L flask is initially filled only with 0.600 mol of HBr.What is the value of K_c at that temperature if the flask contains 0.104 mol of H₂ at equilibrium?

A) 7.04 × 10^-2
B) 4.40 × 10^-2
C) 3.00 × 10^-2
D) 2.10 × 10^-1