The words are intended to show the speaker's natural grace.
Explanation:
In this line of the poem the speaker stands up and leaves the lecture hall, but he does it with a lot of grace similar to a dancer through the hall, he doesn't see anything interesting happening there and he doesn't like to waste his time, then he decides to go somewhere else, and he wonders where should he go.
The best and most correct answer among the choices provided by your question is the first choice or letter A.
<span>Whitman used the words "rising and gliding" to describe the speaker's exit from the classroom because these words </span><span>are intended to show the speaker's natural grace.</span>
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!