Why is Descartes's method of doubt not workable, according to Spinoza?
(a) We are not free to withhold our consent from judgments, because our will is not a free cause.
(b) The human mind is a mode of the divine attribute of thought. But God does not doubt. Therefore, the human mind cannot doubt.
(c) The will and the intellect are the same, so, in particular, it is not possible for the intellect to grasp an idea unless the will affirms the existence of its object.
(d) Doubting is an inadequate mode of extensional predicates.
(e) (a) and (b).
(f) (a) and (c).