The answer is letter D. The reason why encouraging adolescent girls and young women to participate in physical activities is essential because adolescent girls and young women tend to gain more weight. In this period, there are changes in their body which supports heights and physical growth.
So there is a circular flow of income in between two sectors – household sector and firm sector. This circular flow of money will continue indefinitely. In this way the economy functions. But, it is a fact that this flow of money income will not always be same.
Well organized action to eliminate a group.