a. A newspaper reporter who covered the Reagan presidency.
I believe a newspaper would be the most reliable source of information, because newspaper reporters tend to be subjected to higher standard of journalism. Even though it's true that bias would still exist depending on the journalist who wrote the coverages, they are the most trusted sources compared to other people in the options above.
Even though all of the mentioned options represent secondary sources, as they do not belong to President's Reagan's comments about his presidency, the most accurate or reliable source would be the reporter who covered Ronald Reagan's presidency, as his sole purpose was to follow the President throughout all of his affairs while in office. This reporter will certainly have information with a much greater level of detail in comparison to the other sources, which do not focus solely on President Reagan.
To learn about the foods and the importance of papyrus I’m not sure about the third but maybe the clothes and it is not marriage customs I can say 100% and as well I don’t see a river so I don’t think it’s that either
Hamilton meant that judges should be free from polotics so that they can interpret the law and cases in their own perspective, without judgement and/or pressure from anyone else.