Astronomers found two new stars in the Andromeda galaxy; both are red giants, and are therefore _________

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Which choice completes the text so that it conforms to the conventions of Standard English?

A

a dying star.

B

an aging star.

C

massive stars.

D

a celestial body.

Correct Answer: C

Choice C is the best answer. The subject refers to "both" stars, so the noun describing them must be plural ("massive stars").

Choice A is incorrect because "a dying star" is singular. Choice B is incorrect because "an aging star" is singular. Choice D is incorrect because "a celestial body" is singular.