Answer:
Correct answer is Sacagawea and her child helped smooth relations with American Indians.
Explanation:
First option is correct as Sacagawea, who was Native American was helping them with the Natives, especially when it comes to translating and keeping peace.
Although their main goal was to find water route to Pacific, they failed in it, as there is no route that connects Pacific and Mississippi.
They didn't neglected natural world, and they have meet many new species on the west.
Last option is not correct as they reached deep into new territory, where there were no people from frontier.
