What is true about traveling west as part of a wagon train?

A. There were few landmarks or guidebooks to help pioneers find their way across the county

B. Pioneers could not predict how long the journey would take because of the many unknown and dangerous factors

C. During the summer months, few other travelers were on the trails, which made it a lonely trip

D. Early pioneers faced great dangers from Native Americans angry at them for occupying their land

PLEASE HELP