Research questions can be based on various components, including clinical experiences, research problems, and the principles behind clinical theories. Clinical experiences provide firsthand observations and insights that can be used to formulate research questions. Research problems, on the other hand, are issues or gaps in knowledge that researchers aim to address through their studies. Additionally, the principles behind clinical theories can also serve as a basis for research questions, as researchers may seek to explore, validate, or expand upon these principles. Therefore, all of the given options can contribute to the formulation of research questions.