Which One of the Following Examples Illustrates Conceptual Change

Which one of the following examples illustrates conceptual change?

A) As a Boy Scout, Donald has learned how to cook a wide variety of foods over an open fire.
B) Bradley misinterprets the scientific explanation of fire to fit what he believes-that fire is an object with substance and weight.
C) Charlotte used to think that fire was an actual substance, but now she knows it is a chemical change.
D) Darla was not aware of how much damage fire could really do until the house next door burned down.