Descartes' Method of Inquiry Tells Us To

Descartes' method of inquiry tells us to:

A) make the standard of proof absolute certainty.
B) adopt the point of view of someone who knows something and is trying to explain it.
C) adopt the point of view of someone who is ignorant but is trying to learn.
D) deal with questions of being before questions of knowing.
E) doubt everything except truths of arithmetic and logic.