The Leonid meteors of 1833 represent the way how the world changes. Meteors are signs for the Kiowa people. They live in connection with nature and the latter is inseparable for the locals. The event is an harbinger of a new era. The correct answer is the last option.
This is a tricky one, but since it's an allusion to a literary piece, it is likely D) literary. Although I'm second guessing myself a bit since that seems too easy....
What happened: how did climate change come about there Why did it happen: why did the climate change happen in Antarctica When /where : Antarctica Who was involved: was it animals there? Humans?