answer : d.
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explanation : her interest is in investigating the himilaya mountains for reliable information so we have to look for the option that is most reliable.
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a. a travel guide that includes information on sites to see in the himalayas
(a guide, not very reliable and doesn't show any methods for safely climbing the mountain)
b. a website run by someone who has visited the himalayas several times
(again doesn't show any methods for safely climbing the mountain)
c. an article about the latest gps technology available to mountain climbers
(not really relevant to techniques or safe ways to climb a mountain)
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therefore, d. is the correct answer, since it is reliable and helpful for learning which technique and what's the safest way to climb the himilayan mountains.
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hope this helps !
- audrey ♡