If there is nothing in column C, then no advance premium credit was paid on their behalf.  

There is a separate section to input the CA 3895 below the input section for 1095-A on screen 39.4.

The CA credit uses 600% of the federal poverty level vs the federal 400% so the results can be surprising.  

But remember this return may  need to wait for form 8962 to be revised for the American Rescue Plan.