The correct option is A Marxism
The ideology of Marxism introduced the theory of class struggle. According to Marx, the interests of capitalists, who were invariably rich, and those of the workers, who were the lesser paid, clashed all the time. Therefore, leading to class struggle. He believed that a total revolution was mandatory for a state to achieve Communism.
Socialism and Democratic Socialism are less aggressive and do not advocate a full-blown revolution. Capitalism is the ideology that arose out of the high profits of industrialisation, and eventually, more exploitation of the workers.