Answer: the sun, because it is its own star in the solar system. it is not a feature of the earth. meanwhile the geyser, core, and mantle are all things found in/on the earth. hope this helped!
Based on the suffix, decipherable means able to be understood.
The best way Kenya can determine wether the sites she finds are reliable sources is A. She can check if the sites have domains like .gov,.org or .edu in the URLs.
By carrying out her research in these sites, Kenya can guarantee that the information is reliable, objective and verified by the institution in charge of the site. She may not agree with the content, or she may not find exactly what she is looking for easily, but she will make a trustworthy research.
The answer is A, because the protagonist is the main character, and that's what Rider is. The other answers don't really make sense in terms of the role he plays in the story.
Hope I helped!