Final answer:
Passages B and C are firsthand accounts of Lewis and Clark's journey because they come from the explorers' own journals, whereas Passage A is a secondhand summary. The author's perspectives in the passages vary, with Passage A and B being positive and Passage C showing a positive outlook mixed with the awareness of upcoming challenges.
Step-by-step explanation:
The two firsthand accounts are Passage B, which is an excerpt from Meriwether Lewis's journal, and Passage C, which is a summary of an original journal entry by a member of Lewis and Clark’s group. We know these are firsthand because they are direct reports from people who were part of the expedition. On the other hand, Passage A is a secondhand account, providing a summary of the journey without being a direct observation from the explorers themselves.
In Passage A, the author's perspective is positive towards Lewis and Clark’s trip, highlighting the successful assistance by Sacagawea and the accomplishments such as crossing the Rockies and mapping the area. Similarly, Passage B, which is a firsthand account, also portrays a positive perspective, revealing Lewis's joy upon seeing the mountains, indicating their admiration for the new landscapes. Passage C, while also positive, introduces a sense of apprehension about the challenges ahead, differing from Passage B's unadulterated joy.
Jefferson's instructions to Lewis and Clark on their expedition were to find an all-water route to the Pacific Ocean, assert U.S. claims to the Pacific Northwest, explore and map the territory, document its natural resources and wildlife, and establish trade with Native American tribes.