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Question 2 Writing and Language: Science Practice Test for the SAT® exam

Which choice for the underlined material, marked [2] in this excerpt from the attached passage, follows standard English conventions?

“At times, that means relying on geometry to measure how much the [2] position of stars vary over a given period of time. For objects that are farther away, astronomers must get even more technical and use computers to analyze the light stars emit.”