ऐतिहासिक भौतिकवाद (historical materialism) का सिद्धांत किसके द्वारा प्रतिपादित किया गया था?

In which landmark text published in 1848 by Karl Marx and Friedrich Engels was the foundational theory of Scientific Socialism propounded?

What did Karl Marx predict would eventually happen to capitalist societies?

Which one of the following is NOT a part of Karl Marx's materialist conception of history regarding the stages of society?