What hardship did both central pacific and union pacific workers face? (a)attacks from american indians (b)blasting through the sierra nevada (c)extreme weather conditions (d)losing workers to the gold rush

Extreme weather conditions.

The Central Pacific Railroad was a cargo and passenger train company that had operations between California and Utah in the 1860s.  

The Union Pacific Railroad is a similar company set up in 1862, that has country wide operations covering Chicago, Illinois to the Pacific coast. The Central Pacific Railroad, later on became part of the Union Pacific

c. extreme weather conditions

i think they would live in caves or natural tunnels

to unite muslims and hindus in resistance against british colonialism.