Answer
We can rank the values of the resistances from largest to smallest:
$R_2 \gt R_3 \gt R_1$
Work Step by Step
We can write an expression for the voltage as a capacitor discharges:
$V(t) = V_0~e^{-t/RC} = \frac{V_0}{e^{t/RC}}$
For larger values of $R$, the voltage will decrease more slowly. For smaller values of $R$, the voltage will decrease more quickly.
We can see that the voltage decreases the most quickly for $R_1$, so it has the smallest resistance.
We can see that the voltage decreases the most slowly for $R_2$, so it has the largest resistance.
We can rank the values of the resistances from largest to smallest:
$R_2 \gt R_3 \gt R_1$
