If you don't want to cook on teflon, then it seems like (c) is the best option. Sanding it off seems like causing more problems--clouds of teflon dust, and maybe you are left with a surface that is not great for cooking on.
Personally, even though I would not choose teflon when buying new, I do have at least one teflon pot that I still use because it's there and it was free to me a decade ago. The decade of boiling spaghetti in that pot has not had a discernible effect on my family's health. I would not want to do all my cooking on teflon--it's harder to care for than
cast iron AND full of bad chemicals.