The correct answer is option 3: Marx and Engels. The Russian revolutionaries drew their ideology from the doctrines of Karl Marx and Friedrich Engels. Marx and Engels were influential thinkers and philosophers who developed the theory of communism. Their writings, particularly the Communist Manifesto and Das Kapital, provided the foundation for the socialist and communist movements around the world.

Marx and Engels believed in a classless society where the means of production were owned and controlled by the workers. They argued that capitalism led to the exploitation of the working class and the concentration of wealth in the hands of a few. Their ideas resonated with the Russian revolutionaries, who sought to overthrow the tsarist regime and establish a socialist state.

While Lenin and Stalin played significant roles in the Russian Revolution and the establishment of the Soviet Union, they derived their ideology from Marx and Engels. Lenin, in particular, further developed and applied Marxist theory to the specific conditions and challenges of Russia.

In summary, option 3 is correct because the Russian revolutionaries were influenced by the ideas and doctrines of Marx and Engels when formulating their ideology.