Bioluminescence, the biochemical emission of light by living organisms, is found in many marine species. Evolutionary biologists—many of whom ______ this trait to understand predation and mating signals—have traced its independent evolution nearly one hundred times.
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readingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
studies
B
has studied
C
study
D
is studying
Correct Answer: C
Choice C is the best answer. The relative pronoun "whom" refers to "evolutionary biologists" (plural). Therefore, the verb in the relative clause must be plural. "Study" is the plural present tense form.