Even with the Best and Largest Telescopes, We Can't See

Even with the best and largest telescopes, we can't see all the stars in the Milky Way Galaxy, even though these same telescopes can show us other galaxies. Why is that?

A) starlight isn't able to travel through black space
B) the Milky Way Galaxy turns too quickly
C) dust in the space between stars builds up over large distances and blocks the light of stars behind the dustier parts of the Milky Way
D) this is still an unsolved problem in astronomy
E) the lights of Bayonne, New Jersey are too bright and interfere with our observations