Why do political parties involve partisanship?

a. Partisanship refers to bias or prejudice towards a section of the society.

b. In terms of politics, partisanship arises when a person is strongly committed to a particular group of people.

c. It is also characterized by taking a particular side and not having a balanced view.

d. The political parties involve partisanship because their political identity is defined by the policies and interests that they support.