Which of these is an example of a physical change?

A. wood burning

B. a piece of metal rusting

C. sugar dissolving in water

D. a mineral weathering to form another mineral

The D. Burning and rusting are chemical reactions, and the sugar example is a mix between a solid and a liquid at molecular level, but the components remain the same and can be easily dissociated again (i. e., evaporating the water), so the only physical change is the weathering from one mineral to another.