During science class, students combined 1 kg of iron filings with 1 kg of sand to create a mixture. Which of the following methods would be best for separating the iron filings from the sand?
A. Stir the mixture into hot water to dissolve the sand.
B. Strain the mixture through a paper filter to collect the sand.
C. Drag a magnet through the mixture to attract the iron filings.
D. Shake the mixture to cause the iron filings to settle to the bottom