At 25 degrees C, the equalibrium constant Kc for the reaction 2A(g)<-->B(g)+C(g) is 0.035. A mixture of 3.50 moles of B and 5.25 moles of C in a 20.0 L container is allowed to come to equalibrium. What is the equalibrium concentration of A?
A. 3.61E-1 M
B. 1.27E-1 M
C. 1.48E-1 M
D. 2.96E-1 M
E. 1.60E0 M