Here's a problem to solve: A light-year is the measure of how far light can travel in one year. How long has the light from a star 125,000 light-years away been traveling to reach Earth?

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

- A: 12.5 years
 
- B: 125 years
 
- C: 125,000 years
 
- D: 125,000,000 years
 