Which of these best explains why people on Earth cannot see the entire shape of the Milky Way

A Earth is a part of this galaxy.

B Many more stars exist outside the galaxy.

C The stars in the center of the galaxy are extremely small.

D The center of the galaxy consists of a dense cluster of stars.

I believe the answer is A.

Since the Earth is in the Milky Way and not outside it, we cannot see the exact shape of it. Physicists have been able to track and graph the movements of the planets accurately for thousands of years, but that does not mean we know the shape of the entire solar system.