Which quote from “to build a fire” is an example of an internal conflict?

a)“next he brought out his bunch of sulphur matches. but the tremendous cold had already driven the life out of his fingers. in his effort to separate one match from the others, the whole bunch fell in the snow.”

b)“at a place where there were no signs, where the soft, unbroken snow seemed to advertise solidity beneath, the man broke through. . he wet himself halfway to the knees before he floundered out to the firm crust.”

c)“high up in the tree one bough capsized its load of snow. this fell on the boughs beneath, capsizing them. . it grew like an avalanche, and it descended without warning upon the man and the fire, and the fire was blotted out! ”

d)“and all the time, in his consciousness, was the knowledge that each instant his feet were freezing. this thought tended to put him in a panic, but he fought against it and kept calm.”