Which Statement About the Effects of the Comb Jelly, Mnemiopsis

Which statement about the effects of the comb jelly, Mnemiopsis leidyi, on the Black Sea is false?

A) At the peak of its outbreak in 1989, the biomass of this comb jelly was far greater than the world's entire annual commercial fish catch.
B) This comb jelly is a voracious predator of young fish and fish eggs.
C) By reducing the population sizes of zooplankton, this comb jelly indirectly caused phytoplankton population sizes to increase.
D) The comb jelly immigrated to the black sea naturally.