Read the following sentences from "The Youngest Doll." The aunt spent a whole week with her leg covered with mustard from thigh to ankle, but when the treatment was over, they found that the ulcer had grown even larger and that it was covered with a slimy, stone-like substance that couldn't be removed without endangering the whole leg. She then resigned herself to living with the prawn permanently curled up in her calf. The main conflict in these sentences can be identified as:_________.
A. Man vs man.
B. Man vs nature.
C. Man vs society.
D. Man vs himself.