The correct options are
A He argued that an industrial society was capitalist.
B He believed that the communist society will be the natural society.
D The Second International coordinated the spread of socialist ideas.
Karl Marx argued that an industrial society was capitalist. He believed that the only way workers can free themselves from the capitalist exploitation is to overthrow the rule of private property and construct a society where all property was socially controlled - a communist society. He believed that in future, communist society will be the natural society. He developed his thoughts in collaboration with the German thinker, Friedrich Engels. By the 1870s, socialist ideas spread all across Europe. The socialists formed an international body called the Second International in 1889 to coordinate the spread of socialism.