Answer: A fake or artificial body part.
Explanation:
B you would be able to eliminate a and c because it isn't true that it does have any effect on the meaning of the poem and you could tell that personification is used and that it isn't nonsense it's just figurative language
I believe the answer is: B. the shooting of an unarmed rider.
In the speech, there is a dark connotation that made by the speaker when he mentioned the shooting of unarmed riders who are not willing to conform to their orders. Especially to the lower ranks who are bound by the orders from higher officers.