Do sources answer the inquiry question or sub-questions?
You might think that your sources answer your inquiry question. In actuality, sources are primarily used to help you answer your sub-questions, which in turn helps you answer your central inquiry question.
How to map sources to your sub-questions
In the animated image below, notice that the sources are not being mapped to the central inquiry question, but rather to the sub-questions. Multiple sources can help you answer a single sub-question, and many sources may actually answer several sub-questions.