Sentence Completion
While the disease is in state it is almost impossible to determine its existence by

(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

A．octet : musical
B．therapy : physical
C．forceps :surgical
D．comet : astronomical
E． blueprint : mechanical