Option 2 is the correct answer because it provides clear facts about dolphins which are informative.
Informative sentences or reports actually contain useful and relevant information or details. Option 2 actually contain relevant information which will be helpful to readers of Gail's report. Dolphins feed on squids, small fishes, crabs, octopus, etc. Some of these dolphins live in deep water oceans.
I did have not read Burned by Ellen Hopkins. I will however help you out on any questions you may have if you allow me the time to do a bit of research.