Many Dry Cereals Are Fortified with Iron,which Is Added to the Cereal

Many dry cereals are fortified with iron,which is added to the cereal in the form of small iron particles.How might these particles be separated from the cereal?

A) add water and the iron particles will float to the top
B) blend the cereal to a fine consistency and pass through a filter
C) collect the iron filings with a magnet
D) heat the cereal so that the iron particles melt and thereby coalesce