B. Some American Indians kept watch on her party's camp one night during Margaret Frink's journey that challenged her biases about American Indians.
Explanation:
Margaret Frink connects the events throughout her diary by repeating the amount of time she has spent away from home. They were crossing the country to go to California in the gold fever rush. During their travel some American Indians helped them in different ways. She then realized that she has misjudged them. Later she felt sorry for that and went ease with them.
The journey she made with her husband for consuming gold fever was very long and very hard. They had to face freezing storms, blazing deserts and swift-moving icy rivers. They suffered fatigue and hunger during their travel.