Which of the Following Is (Are)correct in a Predator-Prey Cycle

Multiple Choice

Which of the following is (are) correct in a predator-prey cycle?

A) A decline in the number of predators causes a decline in the number of prey.
B) A decline in the number of prey causes a decline in the number of predators.
C) An increase in the number of predators triggers an increase in the number of prey.
D) All of these are correct,causing an up-and-down cycle for each animal.