Answer
We can rank the three sections according to the magnitude of the electric field:
$A \gt B \gt C$
Work Step by Step
We can write an expression for the electric field:
$E = \rho~ne~v_d$
$\rho$ is the resistivity which is an intrinsic property of copper
$ne$ is the carrier charge density which is an intrinsic property of copper
$v_d$ is the drift speed
From this expression, we can see that if the drift speed $v_d$ has a larger value,
the magnitude of the electric field also has a larger value.
We can rank the three sections according to the magnitude of the electric field:
$A \gt B \gt C$
