Final answer:
The correct statement to complete the diagram that connects the expansion of voting rights in the 1800s to Andrew Jackson's election in 1828 is 'Highly educated politicians become less popular with voters,' reflecting the rise of the 'Age of the Common Man' and broader political participation among White men.
Step-by-step explanation:
During the 1800s, particularly in the era of Andrew Jackson's presidency, one of the significant political shifts was the expansion of voting rights. This expansion, however, primarily benefited White men, as the voting rights of other groups, such as African Americans and women, were not similarly extended. With the election of Andrew Jackson in 1828, the statement that best completes the diagram would reflect the political enfranchisement of a broader population of White men and the populist spirit of the time. Therefore, the correct statement is:
C. Highly educated politicians become less popular with voters.
This option aligns with the historical context of the time, which saw the rise of the so-called 'Age of the Common Man' and the democratization of the political process for White men, irrespective of wealth or education.