Which best represents a physical change? A. formation of a new substance
B. formation of a precipitate
C. condensation
D. bubbling

The answer I would go with is A formation of a new substance.

Explanation:

This is because physical change includes changes of state. Some could be changing from a liquid to gas or solid to gas. B is not even an answer that should be considered because it doesn't fit into the category. C and D represents some of the examples of the process of physical change. Like boiling, bubbling, melting, or freezing. So the best would be A.

1.solid

2.carbon dioxide

3.helium

personal, she chose to do it.