D. When climbers arrive at the base, they are amazed by the steep rock face of the mountain and awed by the weather.
Explanation:
The passage that lacks supporting evidence is :
D. When climbers arrive at the base, they are amazed by the steep rock face of the mountain and awed by the weather.
Rest of the passages have supporting evidences a. includes the weather conditions b. includes the name of the climbers and c. includes the location of the K2 mountain.
