Geology, meteorology, and oceanography are all _________ that help us understand the Earth's physical systems.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
a science
B
a discipline
C
a field of study
D
sciences
Correct Answer: D
Choice D is the best answer. The subject consists of three distinct disciplines, so the predicate noun must be plural ("sciences").
Choice A is incorrect because "a science" is singular. Choice B is incorrect because "a discipline" is singular. Choice C is incorrect because "a field of study" is singular.