Consider the oral histories documented in this passage. How you would feel if this experience happened to you?

I cannot feel comfortable if this experience happened to me.

Explanation:

People have passed through horrible experiences in the hands of fellow human beings.  Some of the experiences are better left undocumented, just like these oral histories.  However, I must acknowledge that in the present day, we still witness some experiences that are best left to the imagination.  The fact of human existence is ridden with varying experiences.  It is hoped that these experiences will help us to learn.  They may be painful to bear in the present.  This is why someone has declared that experience may not be the best teacher, after all.  He wrote that the Holy Spirit is the best teacher and mentor.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain