What was the goal of Christian missionaries in Africa?

In their attempt to spread christianity in the area, win converts and transform African societies, Christian missions of all denominations opened schools and disseminated education. Scientifically very important was their pioneer work in African languages.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain