Answer:
"D) The destiny of the Kiowa people lay in their own hands".
Step-by-step explanation:
The "central idea" presented in the introduction of the "Way to rainy mountain" as suggested in the passage is that the destiny of the "Kiowa people" lay in their own hands. The Kiowa people are the mysterious kind of the people known as the "tribe of the hunters" who came from the "mountains" of "western mountain". They are able to control the happenings in their life by choosing the place to live on this earth. Their "lifestyle" is different from that of others.