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The description of the process of bioluminescence starts in the last part of the second sentence. There, the passage describes three necessary components: a light-emitting molecule, oxygen, and an enzyme. Since none of these are among the choices, continue researching. The following sentence groups all of the light-emitting molecules under "the generic name luciferin," making (A) the correct answer.

Choice (B) is incorrect because although most bioluminescent organisms are marine life, sea water is not identified as a necessary part of the process of bioluminescence. Incorrect choices (C) and (D) are the two types of enzymes used in bioluminescent processes, so one of them must be present, but neither is required. An organism that requires luciferase for its bioluminescence will not require photoproteins, and the converse is true.