Astronomers have calculated that the gravitational pull of the black hole is significantly stronger than ______________________.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
the sun
B
the sun’s gravity pull
C
that of the sun
D
those of the sun
Correct Answer: C
Choice C is the best answer. The comparison is between the "gravitational pull" (singular) of the black hole and that of the sun. "That of" correctly substitutes for "gravitational pull."
Choice A is incorrect because it compares "pull" to "the sun." Choice B is incorrect because "gravity pull" is redundant and awkward. Choice D is incorrect because "those" is plural.