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Standard English Conventions Difficulty: Hard

A species of Byropsis algae produces toxins to avoid being eaten by predators. However, in some cases, the toxins the organism uses to protect itself from predation actually blank its attractiveness to predators. The Hawaiian sea slug, for example, not only tolerates Byropsis toxins but actually uses them for protection in the same way the algae does.

Which choice completes the text so that it conforms to the conventions of Standard English?

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Explanation

Choice B is the best answer. The convention being tested is subject-verb agreement. The plural verb "increase" agrees in number with the plural subject "toxins."

Choice A is incorrect because the singular verb "is increasing" doesn’t agree in number with the plural subject "toxins." Choice C is incorrect because the singular verb "increases" doesn’t agree in number with the plural subject "toxins." Choice D is incorrect because the singular verb "has increased" doesn’t agree in number with the plural subject "toxins."