How has existentialism evolved in the twentieth century?

A. the movement became associated with optimism as a positive philosophy
B. the movement became less popular
C. the movement became associated with pessimism as a negative philosophy
D. the movement became linked with religion

B. the movement became less popular

Existentialism saw a decline in popularity in the twentieth century, as other philosophies and movements gained prominence. It also became less associated with optimism and more with pessimism, with thinkers like Jean-Paul Sartre and Albert Camus portraying the human condition as a struggle with meaninglessness and absurdity. Existentialism also distanced itself from traditional religious beliefs, although some existential thinkers did explore existential themes in a spiritual context.