​Which of the following is best supported by the graph?
A
Between month 1 and month 5, the immigration rate was zero.
B
Between month 4 and month 6, a predator was introduced into the ecosystem and increased the death rate.
C
Between month 5 and month 7, the birth and emigration rates decreased and the death and immigration rates increased.
D
Between month 8 and month 12, the birth and immigration rates equaled the death and emigration rates.