The correct options are
A Melting chocolate
C Formation of clouds
D Making ice candy
In a physical change, there is no change in the chemical composition of a substance, only change in physical apperance and properties occurs.
Whereas, in a chemical change, the chemical nature of the substance changes because of formation of a new substance.
Melting of chocolate, formation of clouds, and making ice candy are examples of a physical change. Cooking chicken is however a chemical change.