Hello. You did not inform the answer options, which makes it impossible for me to give you a specific answer. However, I will try to help you in the best possible way.
A research question that could be used is "which techniques for improving and strengthening literacy are most effective for students at all school levels?"
Although this question seems very obvious, it manages to directly touch the point that the research wants to unravel, because through it can be researched the best methods of improving literacy, being possible to apply them and observe the results that they manage to promote in students of different school levels.