The correct answer is D.
<em>The Mormon Trial </em>is the route taken by Mormons from Nauvoo in Illinois to Great Salt Lake in Utah.
The 1,300 mile exodus happened after the murder of the Mormon's leader Joseph Smith. His successor, Brigham Young, proposed the journey to the west on a route called later the Mormon Trail.
Beginning in 1846, thousands of Morons traversed this route, following existing pioneers trails in Iowa, then the Plate River west across Nebraska and into Wyoming, at which point the Mormon Trial frequently coincided with the Oregon Trial. Later on, the Mormon Trial broke south just of the west of the Continental Divide to terminate in Salt Lake City.
The trial was used for more than 20 years, until the completion of the First Transcontinental Railroad in 1896.
