Answer:
The correct answer option is C) A change in the shape of a substance.
Step-by-step explanation:
Physical changes can be defined as the changes which affect the form of a chemical substance but not its chemical composition. These are the changes in which no bonds are broken or formed.
A change in the shape of a substance is a physical change because there is no change in composition of the substance chemically.
While all other options involve a change in chemical composition so they are not the examples of a physical change.