Which posed the greatest challenge to pioneers crossing the western mountains? A. overpopulated rest areas
B. lack of water
C. hot desert sand
D. steep and dangerous passes

Steep and dangerous passages.

Explanation:

It was mountians. Plus, I looked it up. Hope this helped!

answer:

won re-nomination with no opposition he also had the support of his party

explanation:

it saw incumbent president andrew jackson, candidate of the democratic party, defeat henry clay, candidate of the national republican party. jackson won re-nomination with no opposition, and the 1832 democratic national convention replaced vice president john c. calhoun with martin van buren.