Answer:
The poet is expressing a wish for immortality.
Step-by-step explanation:
John Keats's poem Ode to a Nightingale is about the poet's happiness in sharing in the happiness of the nightingale. The poem also deals with the theme of immortality, mortality, and death that the poet addresses.
The given excerpt from the poem is taken from the seventh stanza of the poem. In this stanza, the poet declares how the nightingale is immortal, for its song has been heard by emperors and clowns from generations past. This stanza seems to reveal the poet's desire to be immortal like the bird.
Thus, the correct answer is the fourth or last option.