The correct option is B Sieving
In sieving, the difference in size of the particles is used to separate the constituents particles. A sieve of suitable hole size is used. It allows only smaller particles to pass through. The larger coarse particles remain in the sieve. Sedimentation is a method of separation based on weight and insolubility of a substance in a liquid mixture. The insoluble heavy particles settle at the bottom of the tank when it is left still for a long time.