Answer
We can rank the three sections according to the magnitude of the electric field:
$B \gt A \gt C$
Work Step by Step
We can write a general expression for the magnitude of the electric field:
$E = \frac{\Delta V}{\Delta x}$
From this expression, we can see that the slope of the electric potential versus position graph is the strength of the electric field.
A graph with a steeper slope has a higher magnitude of electric field.
We can see that section B has the steepest slope and section C has the a slope that is the least steep.
We can rank the three sections according to the magnitude of the electric field:
$B \gt A \gt C$
