Final answer:
A caesura is a pause or break within the line of a poem, used for emphasis. The line containing a caesura can be found in the last stanza of the poem "Neutral Tones" by Thomas Hardy.
Step-by-step explanation:
A caesura is a pause or break within the line of a poem. It is used by poets to emphasize certain words or meanings either before the line break or on the following line.
The line that contains a caesura can be found in the last stanza of the poem "Neutral Tones" by Thomas Hardy, where there is no end-stopped punctuation but the line still stands out.