The most accurate response in terms of how the historical context helps the reader understand the meaning of the stanza is:
Knowing that the poem was written to mourn the death of Abraham Lincoln helps the reader understand how people acted during his funeral.
This choice highlights the significance of the poem as a representation of national mourning, as well as the public's reactions and the rituals of honor that took place in response to Lincoln's assassination. The bells, flags, and wreaths symbolize the collective grief and the importance of Lincoln's leadership during a tumultuous period in American history.