The Effect of Interstellar Dust on Starlight Is

The effect of interstellar dust on starlight is:

A) to dim and redden distant stars by preferentially scattering their blue light.
B) to scatter the red light from stars preferentially, making them appear more blue than expected.
C) almost nonexistent, because light does not interact with dust.
D) to make stars appear less bright than expected by absorbing light about equally at all wavelengths.