The author can draw comparisons between the apparatus in use in the past and how it has changed in the present. If the passage were told in the first person, the facts would be different.
What is the height of Mount Everest?
The unique Mount Everest is the tallest Himalayan peak. 8848 meters is how high the huge Everest is. Location of the peak on the border between Nepal and Tibet, China.
Compare and contrast the tools that were employed in the past with how they have changed today, in accordance with this passage. Modern technology uses specialized ropes and ladders and is rather complex.
As a result, option (a) is correct.
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