The buildings in this old mine are made of metal. You can see over 100 years, the silver color of the buildings has changed. The red-brown color is rust. What does this color change tell us about the metal? A) The metal is malleable, so it bends easily. B) The metal reacts in the presence of air and water. C) The dry, desert air has damaged the building over the years. D) The metal is a good conductor of heat and electricity.