Answer
$\overrightarrow{f}_b \gt \overrightarrow{f}_c = \overrightarrow{f}_d = \overrightarrow{f}_e \gt\overrightarrow{f}_a$
Work Step by Step
force of friction depends on 2 variables for a problem: the mass of the object and whether or not the object is moving. Since the object is the same for each situation, only the movement of the object matters.
for a moving object, kinetic friction is constant, so $\overrightarrow{f}_c$, $ \overrightarrow{f}_d $, and $ \overrightarrow{f}_e$ all have identical forces of friction. Static friction is stronger than kinetic friction, so $\overrightarrow{f}_b$ has the strongest force of friction. Last $\overrightarrow{f}_a$ has no force to resist, so it experiences no friction force.
