Answer:
3
Explanation:
I whould say 3 because it's a good option
Compass, it allowed navigation for the new world.
The fundamental flaw in Chadwick's thinking about the spread of disease throughout London was that, Chadwick accidentally caused the deaths of tens of thousands of cholera victims due to his lack of understanding of the germ theory of disease.
Sir Edwin Chadwick was an English social reformer who improve sanitation and public health.
During the cholera epidemic of 1848- 49, Chadwick ordered the replacement of the traditional brick sewers with his self-flushing, glazed pipes in hopes of conveying the sewage to farmers for use as manure.
Hence, during the 19th century, four major outbreaks of cholera disease damaged London communities and led to the death of tens of thousands of people.
To learn more about the cholera here:
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Im not going to type you an essay but i will give you a little help. A lot viet cong soldiers were male children stolen from there villages. Being young their more prone to emotional breakdowns from the load gunfire, being treated as a solider not a child, and most of all witnessing their friends and comrades dying.