How does the author support the claim that Whitman was a battlefield humanitarian?
By showing how Whitman relied on his writing to denounce the horrors he
witnessed during the Civil War
By including first-hand testimony from Union soldiers who benefited from
Whitman's help during the Civil War
By showing how Whitman encouraged Union soldiers to share their personal
experience during the Civil War
By describing different ways in which Whitman used his skills and resources to
help others during the Civil War