Descartes Argues That He Might Be Dreaming Without Being Aware

Multiple Choice

Descartes argues that he might be dreaming without being aware of it in order to demonstrate that:

A) he cannot be sure of his sanity.
B) he might be deceived by an "evil genius."
C) even the clearest sense perceptions may be false.
D) even the simplest arithmetic calculations, such as that 2+3=5, might be wrong.
E) even the simplest logical inferences might be invalid.