Who argued that there is no way for us to prove with certainty that we are not now dreaming?

What detail is explicit from this paragraph?

The venus of willendorf and other similar statuettes have the following characteristics except for

Which statement is true? select one: a. all art created in florence during the renaissance was commissioned by the medici family. b. without wealthy patrons, it is likely that many italian renaissance works would not have been created. c. religion was the driving force behind works created by leonardo and michelangelo. d. the public was responsible for determining whether an artwork was great.