Which of the Following Would Not Be an Example of a Threshold

Multiple Choice

Which of the following would not be an example of a threshold effect?

A) Reindeer population on St. Matthew Island in the Bering Sea had no natural predators allowing for over-population of the species
B) The reindeer population on St. Matthew Island were able to survive because they could find more food in other parts of the island without overgrazing the food resources
C) A majority of the reindeer population on St. Matthew Island died off because the reindeer starved once they overgrazed the food resources on the
D) All of the above are examples of threshold effect