Answer
Part A: The statement that best expresses the difference in structure between the "Giving Women the Vote" podcast and the Declaration of Sentiments is: The declaration is structured like a convincing persuasive argument; the podcast is structured like a documentary.
Part B: What is the main purpose of the Declaration of Sentiments?
The main purpose of the Declaration of Sentiments was to advocate for women's rights and demand equality with men, particularly in the areas of voting and legal rights.