Final answer:
Sartre and Beauvoir focused on metaphysical and circumstantial freedom, emphasizing personal responsibility and the challenging nature of actualizing freedom in our personal lives.
Step-by-step explanation:
Jean-Paul Sartre and Simone de Beauvoir, as existentialists, predominantly discussed the concept of metaphysical freedom in their philosophical writings. Sartre posited that humans are 'condemned to be free,' emphasizing the idea that, while one's situation can't always be controlled, individuals are always responsible for how they respond to their circumstances. This aligns with what he called radical freedom and existential freedom, which is the freedom of choice and action that defines our very being. De Beauvoir further elaborated on the difficulty of actualizing freedom, stressing its importance as a concrete, livable concept, which reflects her engagement with circumstantial freedom, the personal and immediate conditions within which we live our lives.