D! all of the others are commonly used
The Mekong river is one of the primary landforms in the South-east Asian peninsula wherein it stretches 4,200 km from Southern Cambodia to the north of Myanmar. In addition, the river system has been the source of transportation as well as fisheries in settlements surrounding it. The country where the river is not its primary water system would be Vietnam.
The answer is below!
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.
