What is a major difference between the poetry of Emily Dickinson and the poetry of Walt Whitman?

A. Dickinson's poetry is rambling, whereas Whitman's poetry is succinct.
B. Dickinson's poetry is dark, whereas Whitman's poetry is witty.
C. Dickinson's poetry is concise, whereas Whitman's poetry is long.
D. Dickinson's poetry is frivolous, whereas Whitman's poetry is serious.