How to repair a hardwood floor?

I am currently renting, but will be moving soon. There is a small but noticeable groove in my hardwood floor from a couch. I want to fix this before leaving, because I want my security deposit back. How can I fix this?

Go to a local store like menards or fleet farm and they will help you out I think finishing polish will work but check with them to find out what is the cheapest and best.