Answer
We can rank the resistances in order from largest to smallest:
$R_d \gt R_a = R_e \gt R_c \gt R_b$
Work Step by Step
We can write a general expression for the resistance $R_0$:
$R_0 = \frac{\rho~L}{A} = \frac{\rho~L}{\pi~r^2}$
We can write an expression for the resistance in each case:
(a) $R_a = \frac{\rho~L}{\pi~r^2} = R_0$
(b) $R_b = \frac{\rho~L}{\pi~(2r)^2} = \frac{1}{4} \times R_0$
(c) $R_c = \frac{\rho~(2L)}{\pi~(2r)^2} = \frac{1}{2} \times R_0$
(d) $R_d = \frac{\rho~(2L)}{\pi~r^2} = 2 \times R_0$
(e) $R_e = \frac{\rho~(4L)}{\pi~(2r)^2} = R_0$
We can rank the resistances in order from largest to smallest:
$R_d \gt R_a = R_e \gt R_c \gt R_b$
