The correct answer is C. Constellation.
A constellation is a group of stars that form a recognizable pattern in the night sky. Constellations are often named after mythological figures or animals. There are 88 official constellations recognized by the International Astronomical Union.
A galaxy is a large group of stars, gas, and dust held together by gravity. Galaxies come in a variety of shapes and sizes, from the small dwarf galaxies to the large spiral galaxies. The Milky Way galaxy is the galaxy that contains our solar system.
A cluster is a group of stars that are gravitationally bound together. Clusters can be open clusters, which are loose groups of stars, or globular clusters, which are more tightly packed groups of stars.
A congregation is a group of people who come together for a common purpose. In the context of astronomy, a congregation could refer to a group of people who are interested in astronomy or who are members of an astronomy club.
I hope this helps!