Interstellar Dust Obscures Our View of Distant Regions of Space

Multiple Choice

Interstellar dust obscures our view of distant regions of space at optical wavelengths.Which of the following statements is TRUE concerning this dust obscuration?

A) Distant regions are severely obscured only in the plane of the Galaxy.
B) The obscuration of distant regions of space is roughly uniformly over the whole sky.
C) Distant regions are obscured randomly over the whole sky;individual,absorbing dust clouds show no preference for one particular direction or plane.
D) Distant regions are obscured the least in the plane of the Galaxy,and are strongest when we look out into the galactic halo,at right angles to this plane.