An exaggeration
By using the all cap the author successfully exaggerated their point.
The romantic period, which preceded the realist period, glorified war. The Civil War, however, resulted in the loss of many lives on both sides of the war. The horrific reality of the Civil War left no room for such an association in realist works. Realist writers such as Bierce, writing after the war, dwelled on the painful and gory aspects of war. The Civil War also led to a cynical and sometimes bleak outlook on life, which realist writing often reveals.
The exclamation points should not be used in formal writing and professional writing.
An Autobiography would be the best, but it isn't the only option.....
I would still go with D, because it is the person's own narration of a story
