I do not know the answer but why not look the words up in the dictionary.
The themes of the book include morality and womanhood. Cassy commits infanticide not because she wanted to do it but because she had no choice. She was a slave and that meant she did not have the capacity to raise the baby. Despite this, she still made her decision to kill the baby and that shows her 'moral weakness.'
I've been asking myself the same question for years
Hey i really am not sure but i think it might be D. sorry if wrong