Answer
We can rank the circuits according to the value of $L$:
$c \gt b \gt a$
Work Step by Step
We can write an equation for the current across the resistor:
$i = \frac{\mathscr{E}}{R}~(1-e^{-tR/L})$
According to this equation, the current increases more slowly as the value of $L$ increases.
Therefore, $V_R$ increases more slowly as the value of $L$ increases.
We can rank the circuits according to the value of $L$:
$c \gt b \gt a$
