2. Metcalfe and Wiebe found empirical evidence that suggested "aha!" moments were real. They found that warm ratings a. prior to solving math problems, were quite flat. b. prior to solving math problems, rose gradually, but warmth ratings for insight problems showed a steep increase prior to being solved. c. prior to solving insight problems, rose gradually, but warmth ratings for math problems showed a steep increase prior to being solved. d. for solving math problems, were higher on average than warmth ratings when solving insight problems