Correct Response: A. One of the most important aspects of scientific inquiry is the careful observation and documentation of natural phenomena. Annie Jump Cannon carefully observed and categorized the spectra of light emitted from hundreds of thousands of stars, allowing others who followed to build on her work. While scientific progress proceeds at differing rates (B), scientific research should be validated by peer review (C), and scientific breakthroughs sometimes occur by accident (D), all of these are less relevant to the example presented.
