In which conditions is positive sagittal balance present?

In which of the following conditions is positive sagittal balance present?
A C7 is to the left of the central sacral vertical line.
B C7 is to the right of the central sacral vertical line.
C C7 is anterior to the posterior aspect of the S1 body
D C7 is posterior to the posterior aspect of the S1 body

Ans: C C7 is anterior to the posterior aspect of the S1 body