When iron is burned, it combines with oxygen to form iron oxide. The table below shows the densities of all of these substances. Substance iron iron oxide Density (g/cm3) 7.9 1.3 × 10−3 5.2 Based on the information from the data table, which of these is a correct conclusion about the burning of iron? A. A chemical reaction does not occur because both iron and iron oxide have high densities. B. A chemical reaction does not occur because burning iron causes it to melt, which is a physical change. C. A chemical reaction occurs because each iron atom loses mass when it is burned. D. A chemical reaction occurs because the density of iron is different from the density of iron oxide.