Question 3 Writing and Language: Science Practice Test for the SAT® exam

Which choice for the underlined material, marked [3] in this excerpt from the attached passage, offers the most efficient use of language?

“As you can imagine, measuring these distances using miles or kilometers does not make a lot of sense. It would be similar to using millimeters to measure the distance across an entire continent. Clearly a much larger unit of measure is required in such situations, which is why astrophysicists came up with an alternative method to measure huge distances. [3] Instead of miles, they use what are referred to as light years.”


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