Question

the milky way galaxy is not *
an irregular galaxy
large enough to contain 200 to 400 billion stars
a spiral galaxy
part of the local group

Explanation:

The Milky Way is a spiral galaxy (specifically a barred spiral), contains 200 - 400 billion stars, and is part of the Local Group. Irregular galaxies have no defined shape, while the Milky Way has a spiral structure, so it is not an irregular galaxy.

Answer:

A. an irregular galaxy