For Form 8962, I found out I needed to go to healthcare.gov to get numbers for Column B Now I don't know what to do with Column C. What should go into Column C?

I did not take an advance credit. 

The Second Lower Cost Silver Plan amount for Column B was higher than the Column A amount. 

My form 1095A had zeros in Column C but it also had zeros in Column B. 

If I play with the numbers and put at least $1 in Column C it looks like I get the full amount back minus $1.