At a Certain Temperature,K_c Equals 1

Multiple Choice

At a certain temperature,K_c 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