Question: To sift flour,
Option 0: put a metal sifter in a bowl, pour flour into the sifter, then grab the sifter and rotate the knob on the side until all the flour has gone into the bowl.
Option 1: put a metal sifter in a bowl, pour flour into the bowl beside the sifter, then remove sifter and rotate the knob on the side until all the flour has gone into the bowl.
Answer: 0