Assume you have several materials available to build a sculpture for the city hall. When the sculpture is placed outside in the open, the material it is built from may undergo unwanted changes, such as corrosion and erosion.
Which of the following statements best describes the characteristics of the material chosen for the sculpture that would make it resistant to these changes?

• A. The material must not react with acid and must not undergo air oxidation.
• B. The material must have a significantly high density.
• C. The material must be able to undergo air oxidation.
• D. The material should be cost-efficient, there are no other requirements to consider.

Answer: (A)