Question

in the 1800s, violent, anti-chinese riots took place
○ in chinatowns in several cities.
○ in chinatowns in rural areas.
○ at railroad camps in the west.
○ at factories and mills in the east.

Explanation:

In the 1800s, many Chinese immigrants worked on railroad construction in the western United States. Anti - Chinese sentiment led to violent riots at railroad camps in the West. Chinatowns in rural areas were less common, and factories/mills in the East and Chinatowns in several cities don't align with the main context of anti - Chinese riots related to railroad work in the West.

Answer:

C. at railroad camps in the West.