Correct Answer is: (a) W1 > W3, (c) W2 < W4
W1, W3 are the forces exerted by the ball and the spring balance on each other before and after immersion.
W2, W4 are the forces exerted by the tank and the weighing machine on each other before and after immersion.
Let m and M be the masses of the ball and the tank respectively, and let N be the force of interaction between the ball and the liquid in the tank.
W1 = mg W2 = Mg
W3 + N = mg
W4 = N + Mg