Politics can be defined as
a. conflicts over the character, membership, and policies of government.
b. the informal, private organizations through which a land and its people are ruled.
c. a hierarchically structured organization that is designed to distribute labor among several different groups of people.
d. a line-and-staff organization that is designed to facilitate control over complex social arrangements.

A. conflicts over the character, membership, and policies of government.

Explanation:

Politics -

It is the set of activities  that is associated with the governance of the country or a particular area . Politics involves the process of decision making applicable to a group of member .

It refers to exercising and achieving positions of governance - It organizes the control over the human community of  a particular state .

Hence according to the question , the correct definition of Politics is ( A ) .

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answer; american middle class;