In the early 20th century, the Wright brothers developed an airplane, _________ of engineering that changed transportation forever.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
marvels
B
feat
C
a triumph
D
achievements
Correct Answer: C
Choice C is the best answer. "A triumph" serves as a singular appositive renaming the singular concept of the airplane/development mentioned.
Choice A is incorrect because "marvels" is plural. Choice B is incorrect because "feat" is singular but lacks the article "a" which is necessary here. Choice D is incorrect because "achievements" is plural.