Answer the following question given this paragraph: 

Our solar system has only one star. But many stars are in systems of two or more stars. Two stars that orbit each other are called a binary star system . If more than two stars orbit each other, it is called a multiple star system. Figure below shows two binary star systems orbiting each other. This creates an unusual quadruple star system.


Q: How many stars are in our solar system?

 Choices:

- two

- none

- three

- one

A:
one
