Which of these is an example of physical change? a. gasoline burning b. metal denting c. iron rusting d. silver tarnishing

I believe a physical change is one where the physical makeup of a substance is altered as opposed to a chemical change or molecular one which happens on a smaller scale. This would make me think that B. metal denting is accurate since all the other options are examples of chemical or molecular changes. A is an example of a liquid turning into a gas, which is a molecular change. The other two are chemical changes. Hope this is correct. 

The answer is metal denting