Plz help this is a test if its correct i will give u brain thing (this is VERY important)

D.

Explanation:

This is the last question I promise, I will let other people answer lol

I was debating between C and D because they are almost the same

gold discovery in california, and pioneer settlers were sometimes pulled west because they wanted to make a better living. others received letters from friends or family members who had moved west. these letters often told about a good life on the frontier. the biggest factor that pulled pioneers west was the opportunity to buy land.

welcome mark brainliest i am trying to get to the next level.