C. Lines is the correct answer
<em>Ode to a Nightingale </em>is one of the most famous poems written by English <em>Romantic</em> poet John Keats.
The opening lines establish the melancholy mood of the poem and introduce the theme of man's mortality and transience of life.
The correct answer is <u>taking drugs or poison.</u>
<em>"dull opiate" </em>and <em>"hemlock"</em> are mentioned, so the speaker feels drowsy, drunk, high, as if he were poisoned