Four specimens of the same sand have different initial void ratio and confining pressures. Each test is subjected to shear loading under different drainage conditions. The critical state line for the sand is shown in the figure below. For each specimen predict the change in void ratio during each test and the change in pore pressure. Be sure to indicate whether the change is positive, negative or $0.$

$\backslash$table$[[$Specimen$,\backslash$table$[[$Initial Void$],[$Ratio$]],\backslash$table$[[$Initial ${}_{3c}^{\text{'}}$