Answer:
Correct Answer:
b. The physical material world exists
Explanation:
Descartes is an accomplished philosopher whose works is well known. Part of his work is his writing on Meditation which is a series of his personal reflections he penned down in a book.
In The Meditations on First Philosophy, which was written by him in a similar autobiographical style as his other work the Discourse, he describes a six-day philosophical journey from radical skepticism to rational certainty. The only thing he still have reasons to doubt is the physical world existence.