On page 1 of Passage 2, what does the phrase "at the mercy of" suggest about the weather during the time the Norse lived in Greenland?
A. The weather was a powerful force in the lives of the Norse.
B. The Norse felt that the weather in Greenland was reliable.
C. The Norse believed the weather was a reflection of their emotions.
D. The weather was fair enough in Greenland to appeal to the Norse.