The correct answer is "with historical information." When an author is writing an essay about the Boston Tea Party, they can develop the key concept by providing historical information. This means including factual details about the event, such as the date it occurred, the people involved, and the reasons behind it. By presenting this historical information, the author can help the reader understand the context and significance of the Boston Tea Party. To find historical information about the Boston Tea Party, the author can consult primary and secondary sources such as historical documents, books, articles, and reputable websites.