Descartes' Method of Doubt Tells Us To

Descartes' method of doubt tells us to:

A) doubt everything except truths of arithmetic and logic.
B) accept nothing that is not beyond a reasonable doubt.
C) accept only those beliefs that don't contradict what we already know.
D) accept only those beliefs that can be deduced from things we already know.
E) accept only what can be known with absolute certainty.