Which of the Following Is Likely to Have Occurred After

Which of the following is likely to have occurred after 1923?

A) The government has continued the ban on deer hunting and has continued killing cougars and coyotes that immigrate into the preserve.
B) The deer overgrazed their environment, decreasing the carrying capacity of the habitat.
C) The deer population crashed, and no deer have been seen in the preserve since 1947.
D) The preserve was invaded by Eurasian collared doves in 1988.
E) The deer population has continued to increase exponentially until the present day.