Based on the context of Helen Thayer's adventures, you can check the following types of conflicts she faced:
A. person vs. person - She had to get along with Charlie in order to survive. (This can be relevant depending on her relationship with companions on her journeys.)
B. person vs. self - She had to fight through her own injuries in order to survive. (This applies, as personal struggles can significantly impact survival.)
C. person vs. nature - She had to survive the harsh conditions and the polar bear. (This is certainly applicable, as dealing with the elements and wildlife presents significant challenges.)
So, all options (A, B, and C) can be checked as conflicts that Helen Thayer faced.