The event that leads to an end to the war in Vietnam was the surrendering of Saigon state by the South Vietnam.
Option C is correct.
Saigon was discovered in the year 1698 and being one of largest cities in the country of Vietnam. It lies in the southern region of Vietnam but get conquered by North Vietnam in the warfare.
Vietnam war had emerged between its northern and southern regions in the year 1955 and ended till the year 1975. It was considered to be one of the Indo China wars. It was actually started by the country of US where they had attempted to stop the communism rule. It came to an end when the city of Saigon gets fallen down then southern region of Vietnam surrendered completely.
Therefore, the event written in option C is correct.
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