According to the Wikipedia, more than 75% of the worlds most active volcanoes occur on the Ring of Fire.
About 81% - 90% of the words largest earthquakes also occur on the Ring of Fire.
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National integrity is important because it helps a state to promote and uplift all race, sex, class and religion proportionally. Also it helps to fulfill the rights and judicial demand of people. Besides it also helps to make legal provisions for distribution of resources and means of a country equally .
National integration is the awareness of a common identity amongst the citizens of a country. It means that though we belong to different castes, religions and regions and speak different languages we recognize the fact that we are all one.
B is the answer to ur problem