Karl Marx and Vladimir Lenin were social rhetorics, advocates of socialism, and they dealt with social issues. Beside, Lenin was a politician and a revolutionary. Albert Einstein was a scientist, a physicist who dealt with the theory of relativity, studied the cosmos, black holes, and the concept of time and space, depending on the reference coordinate system. The concept of subconscious is part of psychology, and it was dealt with by psychotherapist and psychologist Carl Jung. Some of the things that Jung dealt with, studying the concept of subconscious, are individualism and symbolism. These elements are characteristic of modern literature. Individualism as an attractive form and way of life in relation to society and more interesting than society. The symbolism that Jung studied through archetypes is one way of finding the sense and own mission of each individual, and as such, symbolism is essential in the process of individuation.
The answer is: B. Carl Jung.