Which is an example of a physical change? es ) A) Mixing blue and yellow paint to create green paint B) Adding

Which is an example of a physical change?
es )
A)
Mixing blue and yellow paint to create green paint
B)
Adding water and yeast to bread dough in order to make it raise.
C)
Mixing two liquids together in a test tube and the tube becoming warm.
D)
Adding a piece of chalk containing calcium carbonate to a glass of mild
acid causing the formation of a foam of bubbles.