Which One of the Following Best Illustrates the Concept of Epistemic

Which one of the following best illustrates the concept of epistemic doubt?
a. After reading two competing explanations of color vision, Stuart is beginning to wonder if science is as cut-and-dried as he has previously thought.
b. Mary's teacher says that the earth revolves around the sun. Mary thinks, "How can that be? I see the sun go across the sky each day. Obviously, the sun goes around the earth, not vice versa."
c. After listening to other students in her study group debate possible interpretations of a dialogue in Hamlet, Isilene wonders which of them is right.
d. Randall doesn't think he has the ability to understand nuclear physics.
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