A caesura is a pause or break within a line of poetry, often occurring in the middle of the line. In the stanza you provided, the line that has a clear caesura is:
“Then, Nora, be near me; thy presence doth cheer me,”
The comma creates a pause, which divides the line into two distinct parts. Therefore, the correct response is:
“Then, Nora, be near me; thy presence doth cheer me,”