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Verbal·Craft and Structure·Words in Context

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Many plants can produce and release jasmonic acid (JA), which repulses attacking insects, but there is a reason plants only do so       : JA suppresses genes involved in leaf expansion and other developmental processes, so deploying it outside the context of an immediate threat is unlikely to yield a net advantage.

Which choice completes the text with the most logical and precise word or phrase?

A

haphazardly

B

gratuitously

C

unremittingly

D

reactively