Answer: D. baking muffins
Step-by-step explanation:
A chemical change occurs once some reactants/ingredients are mixed together to create a new product.
In the case of cutting a banana = you still get a banana;
pouring milk = you still have milk;
tossing a salad = cut up veggies = just cut up veggies next to each other;
whereas baking muffins: you begin with flour, sugar, butter, etc. (individual ingredients), and then you bake them (add energy to the system), which in turn gives you a new product = muffins.