This question reffers to the Poem "Song of Myself" by Walt Whitman.
Answer:
The choice of words and the tone the author uses help to show that his voice is one of happiness, self-admiration, and self-confidence.
Explanation:
There may be confusion when it comes to understanding the voice of a poem and the tone.
Let's see it like this: the tone of a poem is the position in which the author addresses a topic, and the voice is the words and the style he chooses to do it.
In this poem, the author celebrates himself, his self-confidence and his words are happy.
"I celebrate myself, and sing myself
"
"Clear and sweet is my soul, and clear and sweet is all that is not my soul.
"
"This hour I tell things in confidence
"
With these quotes we can confirm this answer.
