What does it mean to analyze how themes interact to produce a complex account?

What does it mean to analyze how themes interact to produce a complex account?
a.
To find the theme that appears earliest in the narrative and trace it forward
b.
To examine how themes build on one another to create a nuanced understanding
c.
To select one theme that seems most important and then set the others aside
d.
To rank the themes from most to least important across the whole of the work