Which of the following represents a physical change only?

Question

Quizplus · Accepted Answer

Chopping a piece of wood is a physical change because the wood is still the same substance, just physically broken into smaller pieces.

Option A involves cooking the steak, which involves both physical and chemical changes. 
Option B involves a chemical change because the water is being split into different substances (hydrogen and oxygen gas).
Option D involves a chemical change because propane is being burned to produce heat and other substances (like carbon dioxide and water vapor).

Which of the Following Represents a Physical Change Only