Why does the author have Carton resemble Darnay

A.

to show how inferior Carton is to Darnay, both literally and figuratively

B.

to reinforce the mirror motif and show how Carton transforms himself into the hero

C.

to explain why Lucie comes to take pity on Carton after marrying Darnay

D.

to make readers question if Carton and Darnay are somehow related