Before and during the Civil War, Whitman stood firmly on the sid

Before and during the Civil War, Whitman stood firmly on the side of the North and wrote a series of poems incorporating his emotions and feelings during the period,which were gathered as collection under the title of ______.
A、Drum Taps
B、Leaves of Gras
C、A Boy's Will
D、North of boston
【正确答案】：A