In A tale of Two Cities, when Mme Defarge learns Foulon is really alive, she:

a-goes to tell him she loves him.
b-leads a mob to him where she hangs him and then beheads him.
c-provides a safe hiding place for him.
d-turns him into the authorities.

2 answers

http://www.sparknotes.com/lit/twocities/

I'd think that if you had read the book, you'd know. But this summary website should help.
The answer is B