Correct answer is (b) Squeezing
Easiest explanation: In squeezing, we apply force with the help of a ram. Due to applied pressure ramming of sand takes place but the same load is not able to transmit to the bottom of the mold resulting in lower strength at the bottom portion of the mold. But, in jolting impact force act at the bottom. In jolt and squeezing, uniform strength will be achieved. In hand molding, strength will be non-uniform.