Cavalry Crossing a Ford by Whitman reminds its readers of a pict

Cavalry Crossing a Ford by Whitman reminds its readers of a picture, or a photo, of a scene of (　）.
A、the American War of Independence
B、the Westward Movement
C、the US-Spanish War
D、the American Civil War
【正确答案】：D
【题目解析】：《渡河的骑兵》是惠特曼1881年版《草叶集》中《鼓点》里的一 首，给读者以美国内战时期的景象。