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The correct answer is to provide information about the risk they were facing. Just took the test
The correct answer is D.
In this excerpt of "The Final Assault" by Sir Edmund Hillary, the author is trying to provide information about the risk they were facing.
This is done by the deliverate usage of vocabulary. The author explicitly says that they were on "dangerous ground", explaining that the hill were they were walking was too soft and deep. Because of this, he had no way to tie himself to the ground, which means that if he were to make a wrong move, he would not be secured to anything and would fall.