Which option most accurately evaluates the role of the oregon trail in westward expansion?

The options of the question are, A) its role was essential; fur traders used the trial as means of conducting their trade with minimizing the threat of Native Americans attacks. B) its role was substantial; miners used the trial as a safe route as they attempted to construct a railroad across the West. C) its role was critical. It was the longest and most famous route traveled by the pioneers looking for rich, fertile farmland in the West. D) its role was minimal; some pioneers traveled along this route but many more used the old Spanish.

The correct answer is C) its role was critical. It was the longest and most famous route traveled by the pioneers looking for rich, fertile farmland in th West.

The role of the Oregon trail in the Westward expansion was that its role was critical. It was the longest and most famous route traveled by the pioneers looking for rich, fertile farmland in the West.

The Westward expansion of the United States allowed the construction of the Oregon trail. This trail was a 2,000 wagon road that initiated in Independence Missouri and ended in Oregon City. The trail was also a footpath. This trail was a critical communication path. It was the longest and most famous route traveled by the pioneers looking for rich, fertile farmland in the West in the 1800s.  

do you have a list of sources to choose from?