A．He felt they represented natural light at different times of the day.
B．He noticed that they were the favorite colors of Romantic painters.
C．He performed several scientific experiments that suggested those colors.
D．He read a book by Goethe and agreed with Goethe's choices of colors.
A．Many people have proposed theories about primary colors.
B．Goethe discovered the primary colors by accident.
C．Goethe probably developed the primary color theory before reading Runge's letter.
D．Goethe may have been influenced by Runge's ideas about primary colors.
A．They favored dual federalism over cooperative federalism.
B．They were unclear about the role of the Supreme Court.
C．They wanted to minimize disputes between states.
D．They wanted the Constitution to be flexible.