Answer:
b) obscures visual observation through the plane of the Milky Way.
Explanation:
The "zone of avoidance"
Avoidance zone, an area characterized by an apparent lack of galaxies near the Milky Way Galaxy plane and caused by the mysterious impact of interstellar dust. The zone of avoidance is completely a local Milky Way Galaxy effect.
The correct answer is
b) obscures visual observation through the plane of the Milky Way.