I'm taking a test and have to guess the right answer to the question after the article. Article: While I was on a trip to Papua New Guinea to take underwater photographs, I asked a local dive guide to help me find a pygmy sea horse . I wanted to take a picture of it. These sea horses can be red or yellow-and-orange. The red pygmy sea horse lives on only one type of coral, a red sea fan that grows at depths below ninety feet. This depth made the job even tougher. As the pressure on my body increased, I had to breathe harder, which used my air supply faster. So the deeper I dived, the shorter my time underwater. I had a lot to do. First, I had to find the pygmy sea horse's special type of fan .Then I had to look over the whole fan with my magnifying glass to see if a sea horse lived on it. If not, I had to find another fan--all the while keeping an eye on my oxygen supply. The second fan rewarded me with a find. The dive guide held the magnifying glass so I could have my first look at the tiny fish. My next challenge was to focus my camera on such a small subject. The dive guide pointed at the tiny creature. I looked through the viewfinder on my large underwater camera housing , found the guide's finger, and followed it to the sea horse. It was hard to hold ourselves steady because both of us were floating in mid-water, but our system worked. I could hardly contain my excitement as I focused on the eyes of the cutest sea horse imaginable. Question: Why did the author write the passage? Options: A: To study the natural habitat of sea animals. B: To explain why sea horses are endangered. C: To tell us how to be an underwater photographer. D: To show us how she took pictures of a sea horse.
A:
D