Which of the Following Statements Is True of the Trichromatic

Multiple Choice

Which of the following statements is true of the trichromatic theory proposed by Hermann von Helmholtz?

A) It states that there are four types of cones present in the human visual system.
B) It states that there are three types of rods present in the human visual system.
C) It is based on experiments that show that cells in the visual system respond to red-green and blue-yellow colors.
D) It is based on experiments that show that any color in the spectrum can be matched by combining three other wavelengths.