China's nationalist government collapsed after a war with European armies.
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Need more information sorry.
Answer:
a is 1.
b. is 2.
and c is 3.
BTW, this is not a guess.
Answer:
Factory smoke and other conditions
Explanation:
Back in the second industrial revolution there were many factories being built, and there were a lot of people willing to work for lower wages. Conditions were harsh, as there was a lot of smog, factory smoke, etc. and many people were harmed by the many machines in factories that had no safety precautions. Also, the gases and smoke caused breathing and lung illnesses.
