Iron filing are attracted by magnet. This is a physical property of iron but not of most other materials including sand. How could you use this difference in physical properties to separate a mixture of iron filing and sand

i think its the first one

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the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

what are the awnser choices? i mean, without choices, it is an incompleat