Option C: Reactivity
Since chemical properties are properties that can be measured or observed only when matter undergoes a change to become an entirely different kind of matter.
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C. Reactivity is the answer
Chemical properties are the properties of a particular substance that can be observed in a chemical reaction. Some important chemistries include flammability, toxicity, heat of combustion, pH, rate of radioactive decay, and chemistry.
Chemical properties are the properties of a material that become apparent during or after a chemical reaction. That is, quality that can only be confirmed by changing the chemical identity of the substance.
Physical properties include color, density, hardness, and melting and boiling points. Chemical properties represent the ability of a substance to undergo a particular chemical change. Look for chemical changes to identify chemical properties.
Examples of chemistries are flammability, toxicity, acidity, reactivity (many types), and heat of combustion.
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