During the late-nineteenth and early-twentieth centuries,socialists were divided into two groups,

A) according to nationality.
B) according to gender.
C) according to occupation.
D) Marxist socialists and reform socialists.
E) Christian socialists and social democrats.

During the late-nineteenth and early-twentieth centuries, socialists were divided into two main groups based on their ideological differences: Marxist socialists, who believed in revolution and the establishment of a socialist society through class struggle, and reform socialists, who believed in working within the existing political systems to gradually bring about social and economic reforms. Other ways of dividing socialists during this time period, such as nationality, gender, occupation, or religious beliefs, were not as significant as the division between Marxist and reform socialists.