Why was the Mormon settlement of Salt Lake City successful? O Mormons abstained from alcohol and tobacco.
O Mormons believed in polygamy and prophecy.
O Mormons believed in community and hard work.
O Mormons used slavery and forced labor.

the third one

Explanation:

Their religious faith encouraged them to be hardworking and prevented them from giving up. Brigham Young was a good leader and made the right decisions. The Mormon church owned all the land, water and timber which were allocated to families by their size. They dug irrigation ditches which allowed them to have access to water. At the start, their were not enough Mormons for Salt Lake City to be self sufficient so a perpetual fund was set up which allowed Mormons from anywhere to migrate to Salt Lake City. Also, Young had attracted settlers with varying skills and

occupations to live in the new towns he had founded.