Answer:
C. Too old yet.
Step-by-step explanation:
"The Jilting of Granny Weatherall" by Katherine Anne Porter is about Granny Weatherall who is shown in a bed. She had been an independent person, even after getting old. She had managed to take care of herself without ever troubling either her children or anyone else. So, when she finds that she is in a hospital, she didn't even think that she is in a serious condition.
Part of Granny's stubborn refusal to accept her current, helpless and sick position may have been her self dependent survival all those years. She remarks that her children even still come to her for advice. This shows she's an independent and reliable person even after all the children grew up. Based on the excerpt given in the question, Granny's resistance to conventional ideas is clearly conveyed by her thinking that "she wasn't too old yet", and that she is still capable of taking care of herself. So, she needs no help from either Cornelia or the doctor or even anyone else.