Final answer:
a) Lewis and Clark recruited Sacagawea as their Shoshone interpreter.
Step-by-step explanation:
The best paraphrase of the sentence is: Lewis and Clark recruited a Shoshone interpreter, Sacagawea, to help them throughout their journey.
This accurately reflects that the expedition team sought help from Sacagawea as an interpreter and that she played a crucial role in their journey.
The other options either do not accurately reflect the information in the sentence or include incorrect information.