The correct answer is "D. Emily Dickinson was happy to focus on individual topics instead of trying to cram as many as possible into her poetry, like Walt Whitman did".
Explanation:
Letter D is the only evidence supported option given because it provides an example attached to an argument. Walt Whitman is mentioned as an example to reaffirm the argument that Emily Dickinson used to focus on individual topics, which is the contrary of Whitman's style and works. All the other options are lacking in some way, whether because they do not present a consistent supported evidence, whether because they seem incomplete and sound more like generalizations over some statements.
