Answer:
3
Explanation:
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Answer: Front porch campaign
Explanation: Warren G. Harding's overall support grew until he was nominated on the tenth ballet. He then won office by conducting a front porch campaign.
*Front porch campaign definition court. Wikipedia: "A front porch campaign is a low-key electoral campaign used in American politics in which the candidate remains close to or at home to make speeches to supporters who come to visit."
The earliest civilization known was The Incan Empire.
D is an open ended question because it requires an explanation.