What is one central theme of Ernest Shackleton’s South!?

Iam awful at english and am so confused sos ignore the completely wrong diagram above

Reading plus level g answers for the legendary loshu

How does visiting the place of the gods affect the narrator? a. he discovers that it is unwise to have an inquiring mind b. he learns that there is nothing supernatural to fear in the destroyed city c. he renounces everything he learned from the priests and his father d. he understands that the past has nothing of interest for people of the present