Nadine is researching Lewis and Clark’s journey West. She has read a letter from Thomas Jefferson to Meriwether Lewis, in which Jefferson gives Lewis specific orders. She has also read several entries from Lewis’s diary.

Nadine has read both Jefferson’s letter, which gives Lewis specific orders, and Lewis’s diary entries. Comparing the two sources can show whether Lewis followed Jefferson’s instructions, so B best describes what she can learn. A and C mention only one source, while D merely repeats that Jefferson gave instructions and does not use the diary.

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