For me, the only logical answer is 5.
Student or Learner
Does "become popular for various types of tourists" mean "become popular because of tourists" not "become popular to(well known to)tourists"? The answer is 4 as the question maker argues there's no reason decribed for why it has become popular, but I thought it's because of tourists.
10. Which can't you answer after reading the passge?
① Where is the Galapagos?
② How was the Galapagos created?
③ Who was inspired by the Galapagos?
④ Why has the Galapagos become popular?
⑤ What did the writer do before coming to the Galapagos?
....The Galapagos is a set of volcanic islands which are located nearly a thousand kilometers out in the ocean, off the coast of Ecuador.
(A) That is, I searched for information about the islands, such as famous species as well as their environmental and biological significance. ⓐ_______, what I experienced in the place was much greater than I had ever expected. (B) The islands possess ⓑ____________________________. ⓒ________, the various species in the Galapagos inspired Charles Darwin's great book, The Origin of the Species. (C) The Galapagos has gradually become popular for various types of tourists including those who are interested in ecotourism. Before I came to the Galapagos, I was not much different from other tourists.
Isn't 5 related to this?
That is, I searched for information about the islands, such as famous species