<span>so that the guard would follow its commanders and prevent violence</span>
Answer:
The North Vietnamese attacked the US Navy in the Gulf of Tonkin. This problem lead to the USA beginning to start the war.
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By looking a the options I would say that the answer is A.
Survivors were affected economically because the tsunami destroyed lots of infrastructure that was crucial to the functioning of the economy, such as telephone poles, water works, etc. It affected them socially because it is obviously devastating to endure that kind of loss of life. It affected them environmentally because lots of raw sewage was leaked onto the streets, leading to health issues.
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