Interviewer: What's your most favorite tourist attraction, and why?
Sarah: Definitely the Great Barrier Reef in Australia. It's not just a beautiful place; it's a whole underwater world! You can snorkel or dive and see thousands of colorful fish, magnificent corals, and even sea turtles. It's an experience that truly connects you with marine life and shows the incredible diversity of nature. I find it absolutely breathtaking because _________.
Which of the following best completes Sarah's explanation?
A) it's a bustling city with many skyscrapers.
B) it's an artificial structure built by humans.
C) it offers a unique opportunity to explore a vibrant underwater ecosystem.
D) it's a historical monument from ancient times.