TOEFL Reading: ETS-TOEFL阅读机经 - 7QVTS354RJ84JEC7L$

Why does the author mention "the common firefly" in the passage? A. To relate the light production of marine creature to that of a familiar light-producing species B. To compare the light production of an insect with the more complex light production of marine creatures C. To provide an example of a species that does not use a chemical reaction to produce light D. To support the point that bioluminescence usually occurs at night