Sam's desire to sleep in the cabin means that she had to face setting up camp in the middle of the storm is best explains Sam's motivation, to lead to the conflict in the story.
How does motivation relate to conflict?
Sometimes the desire to do something deserving, decent, or enjoyable is thwarted by the reality that it requires discomfort, trouble, or effort. The organism is then torn between two diametrically opposed goals. An approach/avoidance conflict is one type of motivational conflict.
Thus, option D is correct.
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