In the mid-1800s, pioneers who traveled through the great plains to the west faced
a.) summer rainstorms and difficult terrain.
b.) rugged mountains and steep passes.
c,) summer rainstorms and rugged mountains.
d.) steep passes and difficult terrain.

a.) Summer rainstorms and difficult terrain.

Explanation:

Summer rainrstorms and the difficult terrain were the most common issues and made crossing west slow and dangerous. Particularly, traveling through the Great Plains to the West in summer meant that the pioneers would have to battle with more regular severe thunderstorms, which occasioned drenching storms usually accompanied by hail and powerful winds that could destroy wagons and tents.

b

explanation:

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