I have hated words and I have loved them, and I hope I have made them right.” ... pg. 528
"You want to know what I truly look like? I'll help you out. Find yourself a mirror while I continue." pg. 307
"Sometimes I imagined how everything looked above those clouds, knowing without question that the sun was blond, and the endless atmosphere was a giant blue eye." pg. 350
EXPLAINS, IS
The tour guide EXPLAINS that either candles or a lantern IS used to see into the tomb.
Tour guide is singular. Therefore, verb used must be in singular form.
Lantern is singular and it is the nearest subject of the verb. Thus, the verb must also be in singular form.
What is your question here
I believe it going to be A.