The correct option is C physical
Physical change - In a physical change no new substance is formed and the chemical composition of substance remains the same. There are changes in physical properties like shape, size, appearance, etc.
Melting of ice cream does not produce any new substance and the chemical composition of ice remains the same. Hence it is a physical change.
Irreversible change - The changes which cannot be undone are called irreversible changes.
Melting of ice is not an irreversible change as it can be again converted to its original state on freezing.