I need an answer How are the ingredients in a mixture of Iron fillings and sand affected by being combined?

A. The physical properties of the Iron fillings change but those of the sand do not.

B. Both the Iron fillings and the sand maintain their original physical properties when combined.

C. The physical properties of the sand chance but those of the Iron fillings do not.

D. Neither the Iron fillings nor the sand maintain their original physical properties when combined.​