The change in the vertical stress in the soil mass estimated by Boussinesq's equation when Poisson's ratio of soil changes from 0.3 to 0.5 will be-A-reduction by 30%B-increase by 50%C-reduction by 20%D-no change-D-no change

D no change As vertical stress in the case of Boussinesq analysis is independent of material i.e. E&u. So, no change.