A student wants to examine a substance without changing its identity. Which of the following properties of the substance should the student examine?
A. Ductility, because it can be observed by altering the shape of the substance
B. Flammability, because it can be observed by altering the shape of the substance
C. Ductility, because it can be observed by changing the atoms in a molecule of the substance
D. Flammability, because it can be observed by changing the atoms in a molecule of the substance
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