The correct option is B Sieving
To separate a solid mixture, whose components differ in size, sieving is used. To carry out sieving, a sieve is used which is a type of net. The pore size of seive is such that it lets one component through while stops the other one.
Husk particles are larger than flour, so flour will pass through the sieve leaving husk behind. Thus, husk can be separated from flour by sieving.