The correct answer is C. The cultural beliefs of the characters. Cultural beliefs are always related to a certain period in time and keep changing. This is why we can find out what the historical context is by analyzing what the society values. The other answers are mostly universal.
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.
