C wouldn’t be the answer neither would A or D they are not well supported and I would choose a if I were you so I hope this helped
The quote is an example of Lengthy Speech
In the story the older people were telling the story and when someone asked "When was that" they replied "Very long ago" and they continue to say "beyond the memory even of their great-grandfathers. So with this evidence from the passage what would be the most suitable answer ? I would say the answer should most likely be history.
The best answer is the second one. The authors background in the subject.
