I think B is the correct answer. Answer choices C & D are about dolphins, but they do not have anything related to negative effects surrounding human and dolphin interaction. A, on the other hand, may seem like a good choice, but then again, the answer is too vague.
I mean a parent would get worried at an injury but head and spinal injuries can be very serious and sometimes hard to catch. Like brain bleeds and etc
Answer:
sun to plants, plants to animals, animals to waste I believe
