In the 1970s, Janaki Ammal, a prominent botanist, emerged as a powerful voice in India’s environmental conservation movement. Her exhaustive chromosomal survey of plants in Silent Valley, a pristine tropical forest in Kerala, India, that is home to nearly 1,000 species of native flora (many of which are endangered), ______blank instrumental in the government’s decision to preserve the forest.
Which choice completes the text so that it conforms to the conventions of Standard English?
Correct answer: D
Explanation
Choice D is the best answer. The subject "survey" is singular, and so is the verb "was."
Choice A is incorrect. The subject "survey" is singular, but the verb "are" is plural. Choice B is incorrect. The subject "survey" is singular, but the verb "were" is plural. Choice C is incorrect. The subject "survey" is singular, but the verb "have been" is plural.
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