Given what we know, we can confirm that a physical change would be slicing the substance into four pieces, option A is correct.
Why is slicing the substance a physical change?
This has to do with the fact that this option focuses on the physical characteristics of the substance, such as the shape and size, whereas the other options would in one way or another affect its chemical nature, by reacting with fire, chemicals, or water respectively.
Therefore, we can confirm that a physical change would be slicing the substance into four pieces.
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