The author mentions the activities of fisheries in order to provide an example of（）

A． how ubiquitous the phenomenon of bioluminescence is coastally
B． how predators do make use of bioluminescence in locating their prey
C． how human intervention imperils bioluminescent microorganisms
D． how nocturnal fishing expeditions are becoming more and more widespread
E． how limited bioluminescence is as a source of light for human use