2. For ionic strength and activity coefficients, which of the following statements are correct?(1) For 1:1 electrolytes, ionic strength equals the molarity.(2) The larger the ion size, the less important activity effects become.(3) Activity coefficients decrease with increasing ionic strength.(4) Activity coefficients are assumed to be zero for neutral molecules.(5) The greater the ionic strength of the solution, the lower the charge in each ionicatmosphere.Your answer:
(A) (1), (2) and (3)；
(B) (1) and (3)；
(C)(1), (3) and (5)；
(D)(3) and (4)；
(E) The statements are all correct.