SAT English Practice Question

The scientist’s explanation of the process begins with a description of the phenomenon being studied, followed by an explanation of how the phenomenon can be affected by certain factors. In the second half of the explanation, the scientist discusses the factors that are important to consider when studying the phenomenon, and concludes by suggesting a possible solution to the problem. Which of the following best describes the overall structure of the explanation?

1. A.by presenting a problem and then offering a solution.
2. B.by identifying an anomaly and then providing an explanation.
3. C.by presenting a problem, offering a solution, and then discussing relevant factors.
4. D.by describing a phenomenon, discussing relevant factors, and then offering a solution.