Interstellar dust is more effective at blocking starlight than interstellar gas because
A. the spectral absorption lines from the dust are predominantly in the visible part of the spectrum.
B. gas particles are smaller than dust grains.
C. interstellar dust grains are made up of dark matter, which absorbs all light.
D.the net gravitational effect of the more massive dust grains bends light away from the Earth.
(explain reasoning please)