Which of the following was a factor that attracted settlers from the East to the Oregon Country in the 1840s? Need answer now.

You didn't list options but here is the correct answer

Explanation:

In the early 1800s, traders established a trade route that followed a series of older trails. The route was calld the Old Spanish Trail, and it connected Santa Fe and Los Angeles.

a is correct

hope this let me know if it is right