If $$a = \frac{4}{9}, b = \frac{7}{12}, c = \frac{3}{7}, d = \frac{12}{17}$$ and $$e = \frac{1}{2}$$ then their descending order is

A

c, a, e, b, d

B

a, b, c, d, e

C

e, d, c, b, a

D

d, b, e, a, c