[Solved] The light from a distant cloud of gas and dust looks distinctly red to the naked eye. When a spectrum is taken, it is found that many wavelengths that would normally be expected to be in the middle of the spectrum have been shifted into the long-wavelength end of the spectrum. Thus, the red color in this situation is due to A) interstellar reddening. B) the Balmer spectrum of hydrogen. C) the Doppler effect. D) interstellar reddening, the Balmer spectrum of hydrogen, or the Doppler effect. Spatial Memory: null Proactive Interference: null Retroactive Interference: null Encoding Failure: null