need some help

[meomuopcon]

Her mother doesn't eat meat, and ______

a. neither does she
b. she doesn't, too
c. she does, too
d. She neither does

I think it is "a", but "b" seems to be possible.
But i know we can't use "b" but why?

Pls explain to me

Thank you very much
Kitten

[Casiopea]

too is positive.

Happy New Year!

[Casiopea]

Sorry. What I meant by that is this. a) is the answer. b) doesn't work because 'too' is used in positive sentences.