Why did Sacagawea’s presence in the expedition team put other tribes at ease?

the answer is a)   a sentence of death costs the state "almost three times as much as a sentence of life in prison" (delon 147)

the development of trade during the middle age increased to the change given in the agriculture, which gave money, industry and markets a bigger importance in economy. the agriculture production was more than the consumption, which meant the creation of wider markets out of the areas. besides, with the end of multiple wars, the population increased and new trade routes were created.

in the section of speech is not