The author's opening lines ("America's boys... killing us") capture the audience's attention by:
According to the given question, we are asked to show how the author captured the audience's attention and how he managed to do that.
As a result of this, we can see that the author made use of his opening lines to capture the attention of the audience by making a startling claim about the killing of American boys which captured their attention.
Therefore, the correct answer is option D
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