The researchers, who are both _________ in the field of artificial intelligence, warned about the ethical implications of autonomous systems.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
leader
B
authorities
C
expert
D
a specialist
Correct Answer: B
Choice B is the best answer. The relative pronoun "who" refers to "The researchers" (plural), so the following noun must be plural ("authorities").
Choice A is incorrect because "leader" is singular. Choice C is incorrect because "expert" is singular. Choice D is incorrect because "a specialist" is singular.