C. The peons honor Señor Noboa by putting him on display, but as a result he has a
vision of his own death
Explanation:
This is the most logical explanation for that. The group of peons never wanted to tell Senor Noboa about his impending death hence the reason why they decided to show him on the mirror.
To Senor Noboa, it was about honour being extended to him without knowing that, his death is close by. That revelation on the mirror was simply a vision of how he is going to die.
