Consider the Reaction: a + 3B ⇔ 2C

Consider the reaction: A + 3B ⇔ 2C. Equal numbers of moles for A and B are added to the reaction vessel and equilibrium established. At that point ________.

A) [A] < [B]
B) [A] > [B]
C) [A] = [B]
D) One cannot say unless the equilibrium constant value is known.