The correct option is (C) of the rapidity with which it changes
Explaining modern art is impossible, partly because of its complexity but largely because of the rapidity with which it changes
Grammatical construction is a matching of form and meaning in construction grammar, regardless of the complexity of its formal or semantic structure. Therefore, it is possible to think of words and word classes as examples of constructs.
Here, "rapidly changing" is an incomplete construct and ungrammatical within the context of the sentence. Option C is the only option that rectifies this error without adding any new errors.
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