The distance is extremely large. The distance is a rough estimate. Only light can travel between stars. Light signals were timed reflecting from the star.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The nearest star to the Sun is described as being 4.3 light-years away. Which statement explains why the light-year unit of measure is used in this description?
Possibilities:
- The distance is extremely large.
- The distance is a rough estimate.
- Only light can travel between stars.
- Light signals were timed reflecting from the star.

The distance is extremely large.