Help guysss pls it’s the bottom part that’s the question I don’t understand

Why did brigham young lead a group of 150 people out west? a.) he was a freed slave who wanted to create a community among other freed slaves. b.) he was a mormon leader who wanted to escape religious persecution. c.) he wanted to establish a fur trade with native americans in oregon country. d.) he was a catholic missionary who wanted to establish catholic missions in the west.