What is the perspective of Karl Marx on history?

Marx conceives history as the process by which man creates himself through human work.
Marx criticizes Hegel for conceiving historical movement only under an abstract, logical and speculative form.
Marx believes that the history of humanity is the history of class struggle and emphasizes the basic role that material factors must play in any explanation.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) I, II and III are correct.