[Solved] A construct differs from indirect observables in that the construct: A)is "not observational either directly or indirectly" but can be defined based on observables. B)calls for relatively more subtle,complex,or indirect observations,in which inferences play an acknowledged part. C)is the sort of thing that we can see with the naked eye. D)is the term that lends itself to easy and confident verification. E)is exclusively used for measuring concepts. Trichromatic Theory: A theory of color vision that states the human eye has three types of receptors with differing sensitivities to light wavelengths, corresponding to red, green, and blue colors. Three Types Of Cones: Photoreceptor cells in the retina of the eye that are responsible for color vision; typically sensitive to red, green, or blue light. Frequency Of Impulses: Refers to the rate at which nerve or action potentials are generated and transmitted across neurons. Trichromatic Theory: A theory of color vision that proposes that the eye has three types of receptors with differing sensitivities to different light wavelengths.