Atale of two cities question

which quotation best reveals the relationship between carton and the darnays near the end of the novel?

a.
"now that you have come, i think you will do something to mamma, something to save papa! "

b.
"some half-dozen times a year, at most, he claimed his privilege of coming uninvited."

c.
"he was so unlike what he had ever shown himself to be, and it was so sad to think how much he had thrown away."

d.
"mr. carton's manner was so careless as to be almost insolent."