What Overall Effect on the Visible Spectrum of the Light

Multiple Choice

What overall effect on the visible spectrum of the light from a star results from the light's passage through Earth's atmosphere?

A) The intensity of the long wavelength portion of the spectrum is increased.
B) The intensity of the short wavelength portion of the spectrum is reduced.
C) The intensity is reduced uniformly across the spectrum.
D) The long and short wavelength portions of the spectrum are reduced in intensity, but the middle portion is unaffected.