|Question 4Verbal

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Daniel J. Kliebenstein and colleagues tested whether soil microorganisms from ecologically different settings-ponderosa pine forest, irrigated pasture, and so on-affect plants' flavor chemistry. Although they found associations between plants' glucosinolates (compounds that produce spicy and bitter flavors) and plants' growth conditions, variations in glucosinolates could not be _blank soil microbes specifically.
Which choice completes the text with the most logical and precise word or phrase?
attributed to
A
subverted by
B
excluded from
C
forestalled by
D