Why did Lewis and Clark temporarily separate on their return trip? A. They were preparing to attack a hostile tribe.
B. They were avoiding hostile tribes.
C. They were trying to locate the source of the Missouri River.
D. They were trying to determine the quickest route to reach the Yellowstone River.
E. They had disagreed over the method to be used for mapping.

They were trying to determine the quickest route to reach the Yellowstone River.

Explanation:

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