Iron is a solid, hard metallic element that is used as a construction material for building houses. It boils at 2862°C. Oxygen is a gaseous, nonmetallic element that we used for breathing. Its boiling temperature is at - 183 °C. When iron is exposed in the air, it reacts with oxygen. This process produces rust, which has a chemical name ferric oxide and boils at 1987 °C. Which of the following statements is TRUE about the materials mentioned above?
A. Rust or ferric oxide is a solution;
B. Rust or ferric oxide is a substance;
C. The materials does not boil at a particular temperature;
D. The resulting product of the reaction between iron and oxygen is a mixture


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