Laws are essentially certain rules put in place by our government. You must comply with the law or you will face consequences. Some examples of laws are DUI, Murder, Theft, and the many, many Traffic Laws. Everyone knows that you can't drive under influence, you cannot commit murder, you cannot steal, and you must not violate any traffic laws.
I hope this is the answer you're looking for.
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I think that the element of the story that is least related tot he author's biographical story is the C. SMELL OF MILDEW IN A VIETNAMESE VILLAGE.
Tim O'brien wrote the story using his personal experiences. He was sent to Vietnam in his tour of duty. He's familiar with the geography of the Vietnamese coastline, he vividly describes the climate and landscape, and he feels the fear that the soldier felt during wartime.
The answer i believe is "what"