
Passage: When black long-tailed monkeys find carnivores nearby, they notify their companions with screams. Black macaques make different screams depending on whether the danger comes from land or air.
Question: If which of the following statements is true, it is most helpful to explain the above behavior of black long-tailed monkeys?
A. A.Some land carnivores only eat black long-tailed monkeys, and birds of prey that attack black long-tailed monkeys from the air feed on a variety of animals
B. B.Black long-tailed monkeys climb trees to avoid land predators and potential leaves to avoid birds of prey
C. C.There is no carnivore that poses a danger to black long-tailed monkeys and can attack black long-tailed monkeys both on land and in the air
D. D.Different kinds of predators can deal with different numbers of black long-tailed monkeys
Answer: