SAT Reading and Writing · Rhetorical Synthesis Practice Question

While researching a topic, a student has taken the following notes: <ul> <li>The 1971 Voyager probes were not the same as the 1977 Voyagers.</li> <li>The 1971 Mariner 9 was the first spacecraft to orbit another planet (Mars).</li> <li>It mapped about 85% of the Martian surface.</li> <li>It revealed massive volcanoes and a canyon system 4,000 km long.</li> <li>The mission lasted nearly a year.</li> </ul> The student wants to emphasize the comprehensive mapping accomplished by Mariner 9. Which choice most effectively uses relevant information from the notes to accomplish this goal?

Which choice most effectively makes the student's point?

A
$Its mission lasted nearly a year.$
B
$Mariner 9 was the first spacecraft to orbit another planet.$
C
$Mariner 9 mapped about 85% of the Martian surface, revealing massive volcanoes and a canyon system 4,000 km long.$
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D
$It orbited Mars in 1971.$

Explanation

The goal is comprehensive mapping. Choice C combines the percentage mapped with the discovered features. The others give one fact.

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