Concept:Data is only valuable to a user when it meets their specific needs.Explanation:Relevance is the key quality of useful information.Processed data must relate directly to the decision or question at hand.Even well-processed data becomes useless if it does not apply to the user's situation.Qualitative and quantitative describe the type of data, not its usefulness.Complexity does not add value to data.Therefore, relevance is the most important condition.Answer:C. relevant