The answer is: D. They both challenged the status quo of poetic expression.
Whitman and Dickinson took the poetry and transform it according to each ne style, Emily Dickinson use unconventional capitalization, she liked to capitalize some particular words to drive the reader attention, Walt Whitman also has a unconventional style but he use it to play with the rhythms patters separating his manner from the traditional.
Okay so when we look at the question it is asking what Whitman and Dickinson had in common, And Walt (Whitman's first name) Had a lot of things in common with Emily (Dickson's first name). They both seemed to focus on the same themes and characteristics in writing as each-other.
Your answer would come down to D. They both challenged the status quo of poetic expression.
