The correct answer is C.
When giving a poetry reading, the reader's delivery should convey the tone of the poem. In Answer C, the delivery of deep mournfulness reflects the tragic events of the poem. This statement best evaluates the use of emotion in a poetry reading.
In Answer A, an accent would not accurately convey emotion. In Answer B, a slow and steady delivery would not reflect the energy of the poem. In Answer D, a hurried delivery did not convey the poem's message.
Only Answer C best evaluates the use of emotion in a poetry reading, becuase the delivery of the speaker matches the content of the poem.