Complete the sentence with a suitable option: The passage is primarily concerned with ______________.
A
Defending a controversial approach
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B
Criticizing an accepted view
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C
Summarizing research findings
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D
Contrasting competing theories
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E
Describing an innovative technique
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Solution
The correct option is C Summarizing research findings
The given C is a correct option as it is mentioned in the 2nd paragraph that study of galaxies from the center of rotation. The research is shown that outside the spiral galaxy falls off rapidly with distance from the center. So all in this passage only research findings are elaborated like tests have been done according to Kepler's Law and confirmation is also made according to that law only. Findings suggest that 90 percent of the mass is not radiating at any wavelength to be detected on the Earth. So all this passage is about research and findings of the Kepler's Lawn and galaxies' wavelength from the center.