Concept:The blank requires an adverb that describes a positive and purposeful way to use digital tools.Explanation:The passage advises teaching students how to use digital tools in a proper manner. "Effectively" means in a way that achieves a desired result, which fits the idea of using social media for growth."Widely" refers to extent, not method. "Safely" focuses only on security, not purpose. "Blindly" means without thought, which is the opposite of the intended meaning.Thus, "effectively" is the most suitable choice.Answer:Option C. effectively