One Strategy Considered for Preventing Introduction of Invasive Species Is

One strategy considered for preventing introduction of invasive species is deoxygenating ballast water.This strategy is

A) not useful because it introduces too many invasive species.
B) useful only if ballast water is released at sea rather than in port.
C) currently being used successfully in the United States.
D) too complex a procedure to use on a large scale.
E) not useful because it kills too many beneficial organisms.