Why does janie's grandmother tell her she's a "real woman" now?

Choices:
A) Janie just went through puberty.
B) She knows more than most young girls.
C) She has to take care of the house.
D) She had her first kiss with Johnny Taylor.

I am choosing between 2 choices, B and D. 

Janie's grandmother told her she progressed from a child to a young woman when she kissed Johnny Taylor.

When Janie's grandmother died, Janie realized that she is a "real woman" because she knows more than most young girls.