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（）.

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