Which of the Following Statements Describes a Cyclical Fluctuation

Which of the following statements describes a cyclical fluctuation?

A) a predictable pattern in which a mosquito population increases and decreases in size based on precipitation
B) an unpredictable change in which a mosquito population develops resistance to an insecticide
C) A rare natural disturbance limits the growth of mosquitoes and causes a decrease in the typically stable population size.
D) Limited water in an area restricts the growth of a mosquito population to a level considered to be carrying capacity.