Some Regions Along the Plane of the Milky Way Appear

Some regions along the plane of the Milky Way appear dark because

A) stars in that region are hidden by interstellar gas.
B) stars in that region are hidden by dark dust particles.
C) many black holes absorb all light from those directions.
D) there are no stars in these areas.
E) many brown dwarfs in those areas absorb light, which they turn into heat.