What is the main argument presented by Louis Althusser in his book 'For Marx' regarding the work of Karl Marx?

A. That Marx's work can be understood as a continuous, unified whole with no significant breaks in his thought
B. That Marx's work is primarily focused on the role of humanism in shaping history
C. That Marx's theories are no longer relevant in the post-Stalin era
D. That the young, Hegelian Marx and the old Marx, author of Das Kapital, represent two distinct phases in Marx's thought with an epistemological break between them
Answer: 