Answer:
- The National Jazz Museum's website
Step-by-step explanation:
According to the question, the source that would prove most trustworthy in Ana's research would be the website of 'The National Jazz Museum.' This is because the website would offer first hand authentic data about the history of the musical form, its origin, the artists, and other information without any adulteration. Secondly, the information on such sites are prepared by the experts or scholars and hence, they can be relied upon without any doubt. Hence, this would be the most authentic and valid source for her research.