Answer:
A. Loss and grief can have powerful effects on the mind.
Explanation:
The given question refers to The Raven, a narrative poem written by Edgar Allan Poe. It's one of Poe's best-known works. It tells of a talking raven's visit to a distraught lover, who is grieving over the loss of his beloved, Lenore, and falling into madness.
This poem can be called a poetical study of grief. The speaker attempts to prevent his sorrow caused by Lenore's passing from taking over him. He does this by rational means, but he doesn't succeed as grief is not rational. As the poem progresses, rational thought seems to be leaving him more and more. At some point, a talking raven appears. It repeats the word Nevermore. The longer the bird speaks, the more agitated the speaker grows. He begins to break down, as he finds himself unable to rationally deal with the raven. He obsesses over his reunion with Lenore, losing his hold on rationality.
Based on this, we can see that the central theme of the text is that loss and grief can have powerful effects on the mind.
