Here's a problem to solve: A student uses the following characteristics to describe a group of objects in space. * 200 billion stars * 30 million light years from Earth * 500 light years in diameter Which of the following is the student most likely describing?

Among the 4 following options, which is the correct answer?

- A: a galaxy
 
- B: the universe
 
- C: a constellation
 
- D: the solar system
 