Earth is not a perfect sphere. Due to the ______blank gravitational pull, Earth bulges out on the sides closest to and farthest from the Moon. This distorting pull is known as a tidal force, and it is responsible for the changes in water levels that are called high and low tides.
Which choice completes the text so that it conforms to the conventions of Standard English?
Correct answer: A
Explanation
Choice A is the best answer. The convention being tested is the use of possessive nouns. The singular possessive noun "Moon’s" correctly indicates that there is only one Moon, and it has a gravitational pull.
Choice B is incorrect because the context requires the singular possessive noun "Moon’s," not the plural noun "Moons." Choice C is incorrect because the context requires the singular possessive noun "Moon’s," not the plural possessive noun "Moons’." Choice D is incorrect because the context requires the singular possessive noun "Moon’s," not the singular noun "Moon."
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