At a certain temperature, Kc equals 1.4 × 10² for the reaction:
2 CO(g) + O₂(g) ⇌ 2 CO₂(g).
If a 3.00-L flask contains 0.400 mol of CO₂ and 0.100 mol of O₂ at equilibrium, how many moles of CO are also present in the flask?
A) 0.555 mol
B) 0.185 mol
C) 0.107 mol
D) 0.0114 mol