Read the passage and answer the question.
In national no less than in individual life there are no watertight compartments. No sharp lines can be drawn to mark off the political from the moral, the social from the economic regions of life. Politicians often talk as though one has only to introduce certain political and economic changes for paradise to descend on earth, forgetful of the fact that the efficiency of an institution depends on the way it is worked, which itself is determined by the character and wisdom of the men who work it.
Which one of the following statements most clearly suggests the central theme of the passage ?

Options

A. Political and economic changes can solve all the problems facing the nation.
B. There is no difference between the political, moral, social and economic regions of life.
C. It is not the institutions that are important but the character and wisdom of the people who manage them.
D. National progress depends solely on the efficient running of our institutions.