SAT OwlQuestion bank / Form, Structure, and Sense
The Global Positioning System relies on a network of satellites that broadcast precise timing signals. Originally developed by the US military to help soldiers and ships determine their exact positions, ______
Which choice completes the text so that it conforms to the conventions of Standard English?
many people today use the Global Positioning System (GPS) to find their way in everyday life.
people today rely on the Global Positioning System (GPS) for everything from driving directions to tracking packages.
the Global Positioning System (GPS) is now used by billions of people to navigate in everyday life.
billions of people now navigate in everyday life using the Global Positioning System (GPS).
Show answer and explanation
Answer: C
The introductory phrase "Originally developed by the US military..." describes something that was developed, which is the GPS system. The subject that comes right after the comma must be the thing being described. Only choice C makes "the Global Positioning System (GPS)" the subject; the other choices make it sound as though people were developed by the military.
Choice D mentions GPS, but its subject is "billions of people," so the modifier wrongly describes people as developed by the military.
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