A = LN2 / 2, B = Ln3 / 3, C = LN5 / 5, then the size relationship of a, B, C is

A = LN2 / 2, B = Ln3 / 3, C = LN5 / 5, then the size relationship of a, B, C is

b> A > C, y = LNX / X when Xe