
Passage: When an osprey returns to its nest from a fishing ground with a fish, such as herring, cod or smelt in its mouth, other ospreys follow its trail for food. However, if this osprey is holding a plaice, it is rare for other ospreys to behave this way. Although ospreys eat plaice like any other fish.
Question: Which of the followings is most helpful in explaining the predation habits of the osprey described above?
A. A.Ospreys rarely catch herring, cod or smelt.
B. B.Plaice live in shallower waters than herring, cod or smelt.
C. C.Herring, cod or smelt are herds, while plaice is not.
D. D.Plaice and cod have protective coloration, while herring and smelt have no protective coloration.
Answer: