To demonstrate that matter is conserved during a physical change, the most suitable procedure is:
Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
This method illustrates the principle of conservation of mass in a physical change (specifically, the change from liquid to vapor) as the mass of the water (before and after boiling) allows you to observe that mass is conserved, despite the phase change occurring.
The other options involve processes that might not effectively show conservation of mass due to other variables (e.g., evaporation of water when boiling, loss of scent from apple when cutting, etc.).