The tone of Walt Whitman's poetry is generally characterized as more optimistic and celebratory, contrasting with Emily Dickinson's often more introspective and contemplative tone. Whitman embraced themes of democracy, humanity, and the collective experience, frequently expressing enthusiasm for life, nature, and even the realities of war in a way that reflects a deep sense of connection and joy.
In contrast, Dickinson's work often explores themes such as death, solitude, and the inner workings of the mind, resulting in a more somber and sometimes morbid tone. While both poets delve into complex emotional landscapes, Whitman's tone tends to be more outwardly expressive and affirmative, celebrating life and human experience, while Dickinson often presents a more reserved, introspective perspective.
So, out of the options you provided, the most accurate statement regarding the difference in tone between their poetry would be: Whitman was more optimistic and celebratory.