Given a reaction $A + B \rightleftharpoons C + D$ taking place in a 1L vessel. If we start with 1 mole each of A and B, equilibrium concentration of [C] = [D] = 0.5 M. Percentage of A converted into C if we start with 2 moles of A and 1 mole of B, is

Question

(a) 25%

(b) 40%

(c) 66.66%

(d) 33.33%