Please help me I don't know the answer! What was a NEGATIVE thing that happened because of Missions?

A. Native Americans started to starve to death

B. Disease spread to Native American tribes near Missions

C. Native American tribes fought each other to be friends with Spain

D. Most Native Americans had to move out of Texas to make room for Missions

Which of the following is an example of the pull factor known as economic migration? a. better educational opportunities pulling people towards a new country b. mexican laborers entering the us to work in agricultural jobs c. joining family members that are already in a new country d. crop failures driving people away from their country i am unsure on this question, i was thinking b? but i could be wrong.