Her ____________ approach to problem-solving often leads to innovative solutions.

The correct word choice is "creative," which is an adjective used to describe a noun. In this sentence, it modifies the noun "approach," indicating the nature of the approach to problem-solving. The context implies that the manner in which she approaches problems is marked by originality and inventiveness, which aligns with the definition of "creative."

The other options do not fit properly within the structure of the sentence. "Creation" is a noun that refers to something that has been made or produced; it does not logically describe an approach. "Creatively" is an adverb and would be used to describe how an action is performed, not to qualify a noun like "approach." Lastly, "creativity" is a noun that represents the ability to produce new ideas, but it does not serve as a descriptor for the approach itself in this context. Hence, "creative" is the only suitable choice that conveys the intended meaning.